I enjoy watching standup comedy. Probably not something I would do myself but I don't think I'm too bad atm in talking to an audience... it would take a fair bit of practise though, haha.
How could I have forgotten Robin Williams! The man is a comedy god! Don't really know the other too though.
I just watched her (Wanda Sykes') comedy central special it was great
I have also started to quite enjoy Sue Murphy and Lewis Black. Murphy is great at making fun of herself whilst Black does a lot of political jokes and ranting yet both are absolutely hilarious.