Green Building Concepts - http://www.greenconcepts.com/
Information for homeowners on green building and how they can ensure their homes are as efficient and green as possible.
National Association of Housing Cooperatives - http://www.coophousing.org/
Non-profit homeowners association. Has a list of locations as well as advice and guidelines for staying in the co-operative.
Trent-Moira Co-op Estates - http://tmoz.com/svco/trentmr1.html
Co-operative association in Ontario, Canada. Has information on the location, hosing and also the board of directors.