http://www.pixlr.com/app/

It's like an online version of Photoshop, without all of the bells and whistles. It has some cool filter effects, and is great for when you are on a computer that doesn't have Photoshop and need image editing software.

Try it out, it's pretty neat to explore.

good find thanks for posting this

I mainly use GIMP but this might be another option I can try out

also http://www.splashup.com/ is decent too