Stephen Lynch rocks, really funny guy - been doing the rounds of my real life friends have various videos of him.
As for myself, I find older stuff - Denis Leary, Bill Hicks, George Carlin - and some british guys; Lee Evans & Ben Elton (When he does stand-up he is awesome!) especially.
Recently gotten into Chris Rock comedy videos mind too
(Will get some links after I finish uploading some pics for another topic...)