www.damninteresting.com is one of my favorite...but here are some more. - damn interesting stories

(although i hate to list it, tasteful users sometimes post good ones) www.ytmnd.com - a place of 13 year olds to express themselves...heh

www.boredatwork.com ( thought this would be listed as it was the topic name....and at the bottom of this site, you can see the full list) - huge list of fun/funny sites

www.pbfcomics.com - one of my favorite comics

www.spamusement.com - the older ones are hilarious...'poorly drawn cartoons inspired by actual spam subject lines'

www.ubersite.com - user posted stories

www.exitmundi.nl/exitmundi.htm - a collection of world ending scenarios....really fun

www.10eastern.com/foundphotos - a site dedicated to photos found on p2p file sharing networks

edit: i'm adding descriptions.