From the "why didn’t they think of this sooner?" file: Picnik, a photo-editing site, lets you crop and retouch right from your browser. It's compatible with sites like Facebook, so you can grab your friend's ultra-unflattering shot of you sweating on the dance floor, fix it up, and have her upload -- no one will be the wiser.
Thanks to brides.com for the find. Click here to visit Picnik, happy planning!