Directories 
PLANetizen                      – The Planning & Development Network – a public-interest                      information exchange for the urban planning and development                      community. Offers urban planning news, job opportunities,                      commentary and event calendar.
Cyburbia                      – the urban planning portal – Formerly the Planning and                      Architecture Internet Resource Center (PAIRC), this site,                      run by Dan Tasman, is the oldest and most respected directory                      of planning websites. Offers hierarchical directory of resources,                      forums, columns.
Open                      Directory – Urban and Regional Planning – One of the largest,                      human-run web directories; the urban planning section is well-maintained                      by editor Richard Carson.
  
Yahoo!                      Urban Planning and Design – Yahoo!’s well-known and eclectic                      urban planning directory.
Professional and Industry Associations
American Institute                      of Architects – The AIA is the membership association                      for professional architects; the site features an “architect                      finder”, as well as online continuing education courses.
American                      Planning Association – The APA is the membership association                      for professional planners; the most authoritative source of                      planning information on the web.
Association of                      Collegiate Schools of Planning – Consortium of university                      programs in urban planning; their website includes a list                      of all accredited planning programs in the U.S. and Canada.
Congress for the                      New Urbanism – The most prominent and respected advocate                      for The Newco Urbanism; the website is a comprehensive resource                      for all things related to New Urbanism.
National Association                      of Home Builders – The voice of America’s housing industry,                      with a federation of more than 800 state and local builders                      associations.
Urban Land Institute                      – The ULI is the membership association for real estate development                      professionals; their website is a comprehensive portal to                      real estate research and news.
Publications
ArchNewsNow                      – Kristen Richards’ website and daily e-newsletter features                      architecture and design news from around the world.
Environmental                      News Network – The single-best source for daily news coverage                      of major environmental issues.
GEOPlace                      – Home of many GIS publications online and in print; the site                      offers access to current and archived articles of GEOWorld                      magazine. 
  
Metropolis                      Magazine – The online version of Metropolis Magazine,                      which examines contemporary life through design, architecture,                      interior design, planning, and preservation.
PlannersWeb                      – Home to the Planning Commissioner’s Journal, a respected                      newsletter for planning commissioners and citizen planners.
Planning and                      Markets – Devoted to the study of planned interventions                      versus market approaches, P&M was the first entirely-electronic                      academic journal in planning.
The Planning                      Report – The insider’s guide to managed growth in California,                      featuring monthly planning news and interviews.
Research and Data
  
Economagic                      – This researcher’s paradise features a vast and free collection                      of easily available economic time series data useful for economic                      and planning research, with a focus on economic forecasting.
Government 
Census Bureau                      – The premier gateway to all things related to the Census,                      demographic and business data.
Center                      of Excellence for Sustainable Development – The US Department                      of Energy’s Smart Communities Network featuring a wealth of                      resources for sustainable development.
Department of                      Housing and Urban Development – From webcasts to an online                      library, HUD is the portal to US housing and urban resources,                      including archived consolidated plan executive summaries.
Geography                      and Map Division, Library of Congress – This extensive                      collection includes several thousand historical digital images                      created from maps and atlases and organized into seven categories                      including cities, transit, landscapes, and the environment.
National Transportation                      Library – Run by the US Department of Transportation,                      this website features an impressive repository of transportation                      publications, statistics and other resources.
Environmental Protection                      Agency – Everything you always wanted to know about US                      environmental policies.
US Geological                      Survey – A large collection of data, information and maps                      relating to geology, biology, water, topography and mapping.
US Green Building                      Council – promoting enviromentally friendly buildings.                      Includes lists of certified projects and accredited professionals,                      training workshops and industry research, as well as accreditation                      programs.
The Natural                      Step – non-profit organization helping businesses and                      governments integrate sustainability into their operations.                      Research, consulting services, conferences.
  
Special Focus
Building America                      – [Select the Building America icon on the National Building                      Museum home page.] This educational site contains a fascinating                      historical perspective about land, accessible through an impressively                      designed interactive timeline. 
Carfree Cities                      – Provides a collection of examples and solutions to achieve                      car-free cities.
Housing                      Zone – This web portal for professional builders covers                      a broad spectrum of news and topics such as affordable housing,                      building materials, and remodeling.
  
Knowledge                      Plex – The leading portal for the affordable housing and                      community development field, supported by the Fannie Mae Foundation.
Lincoln                      Institute of Land Policy – The Institute is dedicated                      to improving the quality of debate about land use and tax                      policy, and maintains an impressive collection of materials                      from past courses.
National                      Geographic: Sprawl vs. Smart Growth – National Geographic’s                      outstanding introduction to New Urbanism is only one part                      of their impressive EarthPulse                      website, which features a variety of conservation tutorials.
National Trust                      for Historic Preservation – A resource center for documenting,                      preserving, and protecting diverse historic and cultural places.
Project for Public                      Spaces – PPS offers technical assistance, research and                      education to create and sustain public places such as parks,                      plazas and central squares; transportation; public buildings,                      architecture and public markets.
Reis – Reis                      is the web portal for the real estate investment community                      offering research, news, editorials and market data for over                      100 metro areas.
Sierra                      Club – Offers a variety of tools and information to promote                      responsible use of the earth’s ecosystems and resources.
Smart                      Growth America – A nationwide coalition promoting smart                      growth; the site provides a wealth of information about how                      to get started in smart growth advocacy.
UrbanFutures.org                      – A program of Reason Public Policy Institute, the website                      provides an extensive database of research about market-oriented                      analysis of land use and economic development issues.
Regional/Local Sites
EcoCity                      Cleveland – Promotes ecological design, smart growth,                      and transportation choices in Northeast Ohio. The website                      demonstrates how planning theory is being applied in the region.                    
LUPIN:                      Land Use Planning Information Network – LUPIN is part                      of the California Environmental Resources Evaluation System,                      and the model site for what a state planning website should                      be. The website features an extensive collection of zoning                      codes, plans, reports, and other resources.
Michigan Land                      Use Institute – MLUI seeks to help Michigan avoid the                      patterns of suburban sprawl by offering original research                      and commentary about the environment, transportation, land                      management and conservation.
International Sites
International                      Network for Traditional Building, Architecture & Urbanism                      – INTBAU is a new international network for all those who                      design, make, maintain, study or enjoy traditional building,                      architecture and places.
  
PLANUM                      – The online European planning journal, featuring editorials                      and news from around the world.
Outside The Box
Skyscrapers.com                      – The leading source for information about skyscrapers                      around the world, featuring an impressive database of images                      and statistics for over 42,000 buildings. 
Radical Urban                      Theory – A simple but elegant collection of writings and                      excerpts about the urban condition.
Terrain.org                      – A journal of the built and natural environments, featuring                      articles, essays, editorials, poetry, fiction, artwork, and                      the “UnSprawl” case studies.