I have been impressed with the ideas about Flex Fuel vehicles by Robert Zubrin in his book/talks "Energy Victory" it's a start and a way to transition away from Foreign Oil and all the money that leaves our country due to oil addiction.
or the talk at google:
Authors@Google: Dr. Robert Zubrin
Key to his plan: Have mandate that ALL new vehicles sold in the US be flex fuel capable. So many benefits flow from that as he explains so well in his talks.
Flex fuel vehicles add $100 to cost, but prime a market for bio fuels like methanol, ethanol, etc. from biomass and growing energy. It also opens the market for the rest of the world to get into the energy game... where poor countries can grow biomass.
Craig Ventor and others are working on engineering bacteria to better produce alcohol fuels. It will cause a drop in gas prices to a floor of the cost of producing the alcohol fuels, not the OPEC/speculator manipulated prices. True renewables including wind/solar/hydro/geothermal etc are our long term future, but in the mean-time, bio fuels have much to offer!