The first person that came to mind was: Richard Pryor This is probably because I just watched Silver Streak (God, I love that movie so much!). I really love him though.
Dane Cook Greg Giraldo Steve Martin Brian Regan Mitch Hedberg Kevin James and my favorite: Jim Gaffigan
Chris Farley John Candy John Belushi Robin Williams Bill Maher Ellen Degeneres Dave Chappelle Steven Wright George Carlin Jeneane Garafalo(sp.) Brett Butt Chevy Chase Anyone who played on the show In Living Color(Tommy Davidson, Jim Carrey, Kim Wayans and all her brother Wayans') (What is my fascination with big fat funny guys.............?And why are chicks not as funny as guys?)
Ellen Degeneres Dave Chapelle D.L. Hughley Bernie Mac George Carlin Adele Givens Michael Collier Rickey Smiley my bad, I forgot Whoopi goldberg and Chris Rock
Lewis Black! Wow I'm surprised he hasn't been mentioned yet... others on my list - Dave Chappelle Jon Stewart George Carlin Richard Pryor
IMHO, Jim Norton is the funniest man alive. I got to see him at Bonnaroo this year and I about pissed my pants. http://www.eatabullet.com/index.cfm