Here's a fresh take on the tired old business card. Bump allows you to swap contact information or photos between two phones simply by bumping them together. And the app isn't limited to Android phones either--it works with iPhones as well.
Armed with this smart and fun little app, you'll no longer have to keep track of paper business cards from conferences or meetings, as they'll all be available in your address book (and safely synced with the cloud). For another novel way to throw contacts around, check out Hoccer.