Richard Thompson is a cartoonist I've heard a lot from others about. I wasn't familiar with him until lately, but I like everything of his I've ever seen. His comic strip Cul-de-sac isn't in our paper, so I don't see it regularly. However, it's been describe as being on a level with Calvin and Hobbes and Peanuts, and I can see why. His blog is very funny too, with process sketches, behind the scenes commentary, and illustration work.