This is (hopefully) going to be a big thread.
http://www.****eyed.com - Cool humor science site, check out "how much is inside"
http://www.x-entertainment.com - Cool nostalgic humor site about toys, shows, movies from the past.
http://www.sciplus.com - Webpage of an awesome store that sells lots of different things, military surplus, science instruments, motors, random misprinted odds and ends, cool.
http://memory.loc.gov/ammem/gmdhtml/gmdhome.html - The library of congresses collection of maps in really high detail so it's not for dialers.
http://www.google.com/press/zeitgeist.html - The google zeitgeist, statistics about google searches.
http://www.k10k.org - For cool webdesign.
http://www.homestarrunner.com - Crazy go nuts flash cartoons, make sure you watch the strong bad emails.
http://www.ferryhalim.com/orisinal/ - Some of the coolest flash games you will ever see, really innovative and fun.
More to come but I have to go to a review session for chemistry, later.