Richard and George are legends in comedy. My lecturer even used George's "7 dirty words" in one of our classes, he is a master with word play.
Some of the comedian works that i like includes:
1) Chris Rock (my personal favorite of all time)
2) Dave Chapelle (RICK JAMES b**** !!!)
3) Mitch Hedberg (God took him away too early)
4) Sam Kinison
5) Artie Lange (hopely he will be back on Howard Stern's show come monday)
6) etc etc

Dane to me rose to quickly with the help of myspace which didn't sit well with the "old comedy" people.