Reasons to bike to work abound: economic, environmental, health, happiness, and more.  See some details on each at http://www.bikeleague.org/resources/why/

 Use some critical mass to motivate you to ride!  Use the following opportunities to start biking to work, as you think of others doing the same thing, across the entire nation!  From there we can make it a habit!

National Bike Month: May
The League of American Bicyclists is promoting Bike-to-Work Week from May 14-18 and Bike-to-Work Day on Friday, May 18.

Links:

http://www.bikeleague.org/ -Pretty massive resource

http://www.californiabikecommute.com/ ; -Things to consider as you start riding to work (routes, benefits, etc.) 

http://www.biketowork.com/ ; -Maybe this site will be up by the time you read this?

http://www.43things.com/things/view/22060 -We're not alone!