Well, he's no Einstein, but Eddie Izzard is hilarious. I got Circle and Dress To Kill for xmas and I've watched them many times and haven't gotten tired of it.
I also recommend watching his commedy in french (with english dubbing if you don't understand french) after you've seen his main act. It's like hearing all the jokes again, but this time fresh (and french!!). It's quite fun. Thanks Yuri!!!