We have a 2003 VW Jetta that we bought used about 1.5 years ago to run biodiesel, which we own as a sort of diversification strategy in addition to our Prius. Having learned to drive in an old Mercedes diesel, I can tell you that it has plenty of acceleration. The only problem is that they're pretty scarce to begin with, and are now in even greater demand based on those of us wanting to use bio.

It's license plate, "PHREEUS", is both a reflection of my desire to free us from dependence on foreign oil and a play on Prius. You can see its picture on my plug-in wannabe site:
http://plugin-wannabe.wikispaces.com/PHREEUS

Matt