And my personal crack... Kijiji
The rest I've used for work, or come across while doing work related tech stuff.
http://befuddlr.com/ Befuddlr is a picture type site.
Animoto - another picture type site.
Xtranormal - kinda a movie making type site.
Glogster - like Blogger only different. :) For work there's an eduction version.
Wordle - creates art like word clouds.
As a teacher in a tech oriented world, I use many other sites to stay on top the latest and greatest. These are just some of the ones I thought might be fun for the "normal" world.