I have been taking major steps in transforming my "fleet" into a greener direction. (Outside of the MV Agusta which I doubt I'll ever give up). I've recently put a deposit on a Fisker Karma, which is a luxury plug-in hybrid due for the 2010 model year. This vehicle promises uncompromising performance and 150mpg. Also notable is the Enertia electric motorcycle. Checkout the Green House Gas Calculator on the Enertia site.
Thank you for pushing the envelope:-) My sports-car-loving partner and I have been driving happily in my handsome black Prius since 2003 (with few trips to the gas station, despite lots of Silicon Valley travel and an 11-gallon gas tank). Your message reminds me to look ahead to the next cool green thing to drive in (when BART won't do the trick), especially since my teenage daughter will inherit my Prius.