Verified answer

picnik.com

It's easy and cool and free :D

Picnic

picnik.com is my favorite, it has basic editing, and really cool effects too. you can also add writing and things to it

http://www.getpaint.net/

so easy. so fun. so free.

or http://www.gimp.org/

so complicated. so fun. so free.

Picnik.com is awesome. ^^

picasa

piknik

gimp

photofiltre

photoscape

fxfoto