Bicycle Fixation - Urban bicycling and culture.
Commute by Bike - Bike commuting blog and tips.
Cycledork - Biking blogger who started during bike to work week.
Cycleicio.us - Bicycle lifestyles, news, and views.
International Bicycle Fund - An advocacy group for providing sustainable transport and international understanding.

If you have a site related to Bike to Work Week, Bike to Work Day, or bicycle commuting (in general), please use the contact link at the top of the page. Links to this site are greatly appreciated.