You are nearing the deadline. You are in some shabby Internet café in the third world. Your laptop has been subject to a small missile strike. You need to finish that picture on your USB-drive now!
Well then there is a web solution for you! Try Pixlr, web-based picture editing software.
Pixlr is free and developed in Flash. It will remind you of a Photoshop on a strict Atkins diet, but it’s quite fresh and intuitive. Why not try? Pixlr.com