Comics
Penny Arcade
classic video game comic
xkcd
— comic about language, maths, science, and programming
Everybody Loves Eric Raymond
— about open-source zealots
Toothpaste For Dinner
— badly-drawn pictures with funny captions
Married To The Sea
— old-looking pictures with funny captions
Natalie Dee
— just plain weird stuff with funny captions
Superpoop
— photographs with funny captions
Pictures for Sad Children
— a kind of depressing comic