The project is called Stampede, and aims to bring in $10,000 through Kickstarter. Conceptually, it's a pretty basic idea, but one that's all the more handy for that. It's an ink stamp that conforms to USPS's rules for postcards. So you stamp the back of a photo, slap on your postage, write a note, and drop it in the mailbox. It means it's super easy to take your holiday photo prints, or that box of old photos you just want to get rid of, and start sending them off.