Brad Fitzpatrick, a Google employee from San Francisco wrote and adopted some Android software on what I am assuming is his T-Mobile G1 to scan for his garage door opener’s server (yes! his garage door opener has a server!) then when its detected an authentication process and logging takes place and his garage door begins opening in time for him to pull in.

INTERESTING QUOTE:

I now have an Android Activity (GarageDoorActivity) which interacts with an Android Service I wrote (InRangeService), letting me start and stop the service’s wifi scanning task. The service gets the system WifiManager, holds a WifiLock to keep the radio active, and then does a Wifi scan every couple seconds, looking for my house.

READ ENTIRE ORIGINAL POST
Minor language warning for the young ones
Android Garage Door Opener, part 2