TwelpMe is an iphone app that sends out a call for help in the form of a Twitter "tweet"
with a pre-stored message and the user's current location (using the iPhone's GPS capabilities).
The app is currently under development and scheduled for release in early 2010.
Here's a preview:
... and for testers, here's a little help getting started:
TwelpMe is an iphone app that sends out a call for help in the form of a Twitter "tweet"