Or 100 times more even (in my case)... It's even better when, in addition to having a cheaper vehicle and using less gas (i.e., zero gas), you're faster than they are too. I have had a couple of my closer calls with Priuses.

Other dangerous classes of vehicles in no particular order (and most, if not all, already mentioned):
TAXIS!!!
BMWs
SUVs, particularly Ford Explorers and Expeditions for some reason

I find that the white utility vans in my experience tend to be pretty courteous. Must be they know I can call them in w/ their vehicle number if they're an ass to me behind the wheel. All I need to memorize is the vehicle number and the company name. The rest is in the phone book. Even UPS drivers are pretty good, when they're actually driving. My issue with them is their habit of double parking in the bike lane.

Other good drivers:
Cars w/ bike racks
Scandinavian cars: Saabs and Volvos
Subarus
VWs

I try not to let my guard down, though, with any car. This is, after all, just profiling.