I was going to write a bit about how great he is, but for the moment, if you don't know who he is then I'll just let these few clips give you a taster. The thing about Stewart Lee is that, if you enjoy those clips, then you'll probably like most things that he's done. If not, then you'll probably hate him.
http://www.youtube.com/watch?v=0YE9Kthyacohttp://www.youtube.com/watch?v=nZB6q_RLHRUhttp://www.youtube.com/watch?v=SAVrM29MjR8And then the motherload:
http://www.stewartlee.co.uk/oldshows.htmNote, the first three aren't necessarily his best, his worst or anything in particular, they're just the first few that I found on YouTube.