I went to the late Louis CK show last night (10:30pm show), and it was typically hilarious. I'd see Louis do anything. He's that funny.
But I was really surprised by how funny his opening act was. Hannibal Buress was hysterical. I've been watching his older stuff on video this morning, catching up on a very funny career. Here's a special from early last year (filmed at the Vic Theater in Chicago). He didn't do any of this stuff last night...which means he's a great comedian. Constantly updating his material. I'm impressed.
(Warning: NSFW)