A few really good signs in recent months. In April the Honda Insight hybrid became the best selling car in Japan. Not the best selling hybrid, or best selling in some other niche. The best selling car.
Also, in 2008, “For the first time, investments in green energy overtook investments in fossil fuels for power generation ($140 billion vs. $110 billion)” according to a UN study. This is investments for power generation, not transportation fuel, but see above – electricity becomes automotive fuel.
The overall math on worldwide energy supply is scary but these are very good signs.