Hyperbole & a Half just started back up again, and her posts are hilarious. There are for sure more famous posts than this one, but it makes me laugh a lot. I also like reading about her dumb dog and guide dog.
Jake & Amir are hilarious. Their videos can be found on College Humor, or their dedicated site that I linked to. They also recently started an advice podcast (that I'm listening to for the first time right now while writing this).
What do you read when you want a good laugh?