Water Use it Wisely - water conservation tips:  http://www.wateruseitwisely.com/100-ways-to-conserve/index.php   

United States Environmental Protection Agency: http://www.epa.gov/watersense/

United States Environmental Protection Agency - info for kids:  http://www.epa.gov/watersense/kids/index.htm 

H2Ouse.org:  http://www.h2ouse.org/