Cycling
Bikeride.com - http://www.bikeride.com/
Lists cycling related events from across the United States and Canada, plus a Web directory of over 1000 bicycling related sites, ride reports, blog, and cycling photos.
Cycle Chat - http://www.cyclechat.net/
A friendly place for everyone with an interest in cycling.
International Bicycle Fund - http://www.ibike.org/
A non-governmental, nonprofit, advocacy organization, providing information and resources promoting sustainable transport and international understanding to make this planet a healthier and happier place to live.