Zombo.com is probably the most useful site on the internet after wikipedia.org.
Math Rules
Private Eye cover collection Many are dirty.
An Anglish Wiki.
Labels by the Sheet .com
A tutorial on how to read the Zippy daily comic. Not too pretensious and, astoundingly, serious!
Only have a minute? Try Book-a-minute.
Generate your own eye-candy graphs and comparisons.
Buy a Stirling Engine.
A prediction market for political events. Caveat lector.
A list of artificial languages with links.
A blog written by a robot with 60 comments by robots.
Ian Albert .com -- lots of good stuff.
An ambigram generator.
Bruno Bozetto animated shorts.
A favicons gallery.
The calculator I wish I had when I was in school.
duckduckgo.com
Flashy guide to electronic music.