Good afternoon all
I happen to be a great fan of comedy...written, stand up, etc...so here's my list, in no particular order - 
Stand Up-
Bill Cosby - classic comedy, end of story
Eddie Izzard - guy in makeup and heels, british wit...how can you go wrong?
Robin Williams - guilty pleasure
George Carlin - offensive but intelligent, more amusing that laugh-out-loud funny
Dennis Leary - just because
Written -
Dave Barry (HUGE fan of Dave Barry)  I think it's his word selection that makes him so funny...he has a way of telling the most simple story that has me in tears.  
TV - 
Seth MacFarlane...the genius behind Family Guy.  Anyone who knows his musical theater and isn't afraid to spoof it on television has gotta be cool.  
Alan Alda - M*A*S*H in general is more apt to make me actually laugh out loud than almost any other TV show.  
Movie-wise, I'm very picky about my comedy.  I have no use for slapstick in general, old or new.  
David Spade was wonderful as the voice of the Emperor in Disney's The Emperor's New Groove...but I can't stand him in his other works. 
Jim Carey...he can be funny, but once he starts in on his trademark goofy comedy, I get bored very quickly.  
I loathe Ben Stiller, and do not find him in the least bit funny.  Most of my friends adore him...I keep my mouth shut.  
k, enough out of me for now