I found this today while browsing Cydia. It’s a tracking and remote wiping application for jailbroken iPhone.
Interesting concept but their page looks very flaky to say the least. They don’t even have a privacy policy on the site.

And of course it’s useless after a restore.
http://www.cylay.com/index.php
Cylay, from iFoneTec, is the world's first iPhone security product that fights theft, tracks lost iPhones, protects data and information, and controls a lost iPhone remotely.
It is capable of identifying the current user of an iPhone after its original owner loses it. In addition, it allows the original owner to delete and back up important information via SMS and the Internet.
To protect your iPhone completely, please purchase the Cylay VIP version for only $19.99 per year.