Here in the Bay Area (SF) You first have to get a special Hybrid Fastrac bridge toll transponder. Try here:
http://www.bayareafastrak.org/
After that is recieved you must apply for the new HOV stickers, which can't be mailed until after 1 Jan 07 when the new law goes into affect.
This will qualify you for the HOV lanes but I don't believe you are excused from paying bridge tolls. (Unless they changed it recently)
http://www.bayareafastrak.org/static/ne ... tml#hybrid
The hybrid sticker option was supposed to expire in '08 but I think it has been extended until 2011