Andrew Casteel —
The Alameda Harbor Bay and Alameda/Oakland ferries announced that bicyclists can ride free the ferries all day on Bike to Work Day, Thursday, May 12, 2010. To get the free ride, you have to have your bike with you when you board the ferry. This is the fifth year that the ferries have participated in the annual Bike to Work Day event.
You can find more information here and here.