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Use SafetyNet’s map to select bad neighborhoods. Then, if you end up > in a sketchy area, your mobile will switch into watchdog mode. If > trouble arises, all you have to do is shake the handset and your phone > will set off an alarm, start sending your location to friends and > family every 30 seconds via Google Talk, take a picture, turn on its > speaker, and dial 911 (or another emergency number) . The app > announces each of these steps out loud so a would-be assailant can > hear what’s happening and give up.

Från Wired: Inside the GPS Revolution: 10 Applications That Make the Most of Location