Just for fun, here's a link to IFC's list of 50 Greatest Comedy Sketches. Naturally it's a little SNL heavy (having 30 straight years will do that), but it bounces all the way from "Who's On First?" to "Monty Python" to "Chappelle Show." Great fun. My favorite discovery so far was Chappelle's "Racial Draft" bit (#12). That show was always up and down, but they never pulled punches and I loved that. I also loved Richard Pryor and Chevy Chase doing word association (#15).