There is a biodiesel pump in Philadelphia at the Shell station on 11th and Vine. It's only B20 but it's very good fuel Since 300D tells me so. At that location, it's usually about $.20 cheaper than full dinosaur diesel in town but still not as cheap as regular dino out on the interstates (not the PA turnpike though) where trucks make up most of the volume and help keep the prices down.
Up in NYC there are three stations with varying grades of bio but I've not fueled up at any of them. I hear good things though.
So, they are becoming slowly more prevalent, but very slowly.

Phil Forrest

__________________
1972 220D "Trudy," named by a friend.

"The 220D sounds good... I suspect it is the only car that you need a calendar for, rather than a stopwatch, when doing acceleration tests."
Tom Abrahamsson