http://carsabi.com/ also recently pulled craigslist results:

"June 12th: We no longer include vehicles from Craigslist, as they have requested that we not index their listings"

Too bad, it is a killer car shopping site, but without the massive craigslist db of results, they won't have nearly as much to offer.

Craigslist should really introduce a paid API or something, since they seem to hate being scraped. I think they fear becoming irrelevant.