xkcd is "A webcomic of romance, sarcasm, math, and language." It's pretty funny, especially for people like us, who tend to know quite a bit about match, science, etc.
It's the only webcomic I read, and there are quite a few funny ones. A few that I particularly enjoy are 612, 331, and 598.
The comic updates three times a week: Monday, Wednesday, and Friday. I figure many people here will enjoy xkcd, so why not start a discussion about it?