Emergency Apps for Your Cell Phone 

Emergency Distress Beacon (IPhone)

Send My Position ( Androis)

GroupMe
 (iPhone - Androis - Blackberry)

FEMA Daily Update (iPhone)

iEmergency

MacLight

Spot Crime

Find My iPhone

Where is my Droid

Track your stolen laptop for free

Lookout Mobile Security

Lost your Android phone? Try Plan B

iSPY Connect