Check out this video to get a taste of his comedy (which he's unable to perform now while waiting for a liver transplant) and to see just how sick he is. Looks like he still has his sense of humour, though, which is great to see.
I can't count the number of times I've watched Mike perform live and he always – always! – destroys. I've only ever interviewed him once, back in 2002. If you want to check it out, follow the link to comedycouch.com. It's a good one.