bikely.com is a nice site for mapping and sharing bike routes. From the site
Put very simply, Bikely helps cyclists share knowledge of good bicycle routes.
It can be quite tricky traversing a car dominated city by bicycle, particularly when you need to travel an unknown route to a new destination.
But the chances are, someone has cycled that way before you. Bikely makes it easy for him or her to show you the best way.
Here is the route I traveled to work this morning. It took 10 minutes and cost me nothing but a bit of pedal power- no gas, no parking, nothing.
Biking is a viable way to get to and from work and a great way to contribute to a healthy lifestyle and more sustainable urban culture.