Apptopia

One of the oldest anti theft applications on Android Market with over 500,000 downloads.  The sale comes with the mobile client as well as the server code (extremely effcient that can handle large amounts of traffic).

It is currently monetized through just ads on the website as well as donations which generates around between $300-500 a month.  The application is already established as an anti theft application in a very competative market, and it has some extremely good press, eg:

http://www.youtube.com/watch?v=3eUp07jJ5_Q

and

http://www.thesun.co.uk/sol/homepage/news/3440895/App-finds-phone-after-1000ft-fall.html