Pixlr Is the New PhotoshopI've been using the Pixlr editor since my last Photoshop-equipped laptop crapped out in 2009. It's flash, web-based and completely free. I'm sure real digital artists can do better than poorly cropped off heads of the Heroes of the Federal Reserve attached to, uh, used car salesmen.
Here are some excellent examples of what I've been able to accomplish with Pixlr over the years; if you actually try, you can probably do some editing 15 - 55 times better than this.
Danger, the next one may not be SFW depending on a) if you work and b) whether or not you want your coworkers to see you looking at money coming out of someone's ass.
See? It's amazing. (here are some others)
Play with Pixlr here or find them on Facebook. They have recently introduced Pixlr-O-Matic to make your images look like you "left them on the dashboard of your 68 VW camper all summer."