Congratulations to my buddy Walt Doyle! His company, publishes the Facebook app, Buddy Beacon, which you use to broadcast your physical location to your friends. They’ve got and iPhone app and, just recently, they announced a partnership with Garmin to provide an overlay to Garmin’s GPS maps so you can see where your online friends are in the physical world.
No more calling your friends for directions to the party. Just have them check in on Buddy Beacon and you can get instant turn-by-turn directions!