Slip — Utilities — Free
Slip knows that exchanging business cards can be annoying. You have to find your cards and then take theirs and then maybe jam it into the back of the thing where you keep your cards, and hopefully it fits. And then later, you find their card and can’t remember why you’d met in the first place.
So instead of that, Slip uses Bluetooth to exchange contact information wirelessly. You go in and toggle which bits of information you want to share and just flip it over to another user with a single swipe. You can also text or e-mail it to people without Slip, but that’s not as much fun.