Bill Hicks is my all-time favorite comic. Dave Chappelle and Mitch Hedberg are way up there too. George Carlin and Chris Rock are good. I saw some pretty hilarious stuff by Demetri Martin recently. Sarah Silverman is hit or miss, but when she hits, it's pretty damn funny.

From what I've seen of the comedy central show, Carlos Mencia is just repetitive and stupid. I've never seen his stand-up but I can't imagine it being much better.

Also, I really don't understand the fuss over Dane Cook. His jokes are generally predictable, and those that aren't are generally only a little funny.