InstaMapper
A free service that allows you to track a GPS-enabled cell phone online in real time. A small application is installed on iPhone, Android, BlackBerry or Motorola iDEN devices which reports the location of the phone to the InstaMapper servers. The iPhone app updates the location only while the application is in the foreground. For the other devices, locations are updated a minimum of once every 60 seconds. The current location and the last 30 days (or up to 100,000 locations) of data for a tracked device can be viewed or downloaded at the InstaMapper website.