Judy Gruen
Site featuring columns by noted humorist Judy Gruen, along with her books, blog and special reports.
http://www.judygruen.com

Natural Resources Defense Council
Non profit that uses law, science, and the support of its 500,000+ members to protect the planet's wildlife and wild places and to ensure a safe, healthy environment for all living things. Provides information on many environmental issues.
http://www.nrdc.org/

Open Directory Project
Help build the most comprehensive human-reviewed directory of the web.
http://dmoz.org/

Oikos - Green Building Source
Oikos is an Oregon based distribution firm with many links to green design resources. Features a Green Product Directory and a Green Building Library. Useful for commercial green builders and novices seeking professional information.
http://www.oikos.com/