Picnik
Picnik is one of the most useful photo editing tools you can find on the web, and the best part of all is it's free! Currently it can import photos natively from Facebook, Myspace, Picasa, Flickr, Yahoo Image search and also offers options to upload from a computer or to upload from a website. Whether you're looking to crop, resize, recolor or reformat an image, Picnik is a must have tool.
statistics and definitions provided partly by wikipedia.org