I usually visit Kuro5hin (to check up on stories and the various diaries I like to read), The Cellar (especially the image of the day), Metafilter, UserFriendly and my own board that my friends and I hang out on. I'll also come here and talk on the the chatterbox.

I forgot to add before posting that I also like to occasionally take breaks from the computer entirely. Playing basketball, throwing a frisbee around, reading, and generally doing other stuff that isn't computer related.