With all this hype about CS5 and the Self-Aware Photoshop you must always remember that most people can’t necessarily afford it.
CS5 is a luxury item, and there are many online and free alternatives (although none of them, of course, have the feature set like Photoshop).
One such online image editor is Pixlr, which I’ve found handy a few times (when I had to re-install Photoshop).