Share Your Location In Real Time

You may notice the DIY lojack idea well here is more information on this topic:

Mologogo is a free service that will track a "friends" GPS enabled cell phone from another phone(gps not required) or on the web. Mologogo also serves as a dirt-cheap tracking system, so go ahead and fauxjack something.

It currently works on pretty much any Nextel phone with Java and GPS - even a $60 no-contract Boost Mobile phone.

For more information:
(http://www.mologogo.com/)