Pixlr is a free online editor where you can edit, adjust filter, rotate, flip
Pixlr is built for non-professionals, users that have basic editing needs. It's not for large RAW images (file conversion) or for printing. It is merely a tool for editing web images to be posted on blogs, news-sites, social networks like Facebook, Bebo, and image sites like Flikr, Photobucket etc. (Pixlr FAQ)
Will try it when I have time to do some editing and post my comments here.