Basic image editor with dozens of effects, overlays, filters and borders.
"Turn your photos into cool looking vintage and retro snaps! With this fun and simple darkroom you can apply filters, lighting and borders as easy as one two three.
Download Pixlr-o-matic for your desktop and create vintage photos even without an internet connection. Just click install on the button to the left and get going."
[Note: There's also a browser-based version at http://pixlr.com/o-matic/]