Okay, one last pointer to Green Car Congress and then I'm done for the day, I promise.
Daimler-Chrysler has announced that it will fill the tanks of new Jeep Liberty Diesel SUVs with "B5" -- 5% biodiesel -- to encourage wider use of renewable fuels. The Liberty Diesel gets 30% better mileage than the gasoline version, and has 20% lower emissions. GCC has the details.
It's a symbolic step, but symbols are important.