There has been a thread called "cop registration for your bike" that broached (sp) the issue of a GPS chip hidden in the frame to allow the tracking of stolen bikes.
Unfortunately no one has any info on the practice and I'm looking to see if anyone else (outside of that thread) has some solid info on where, who, how much. If it's even slightly affordable, I will get all my bikes done, without delay.
there is also another great idea in the thread called RADAR, I suggest you check it out.
Your Lord and Saviour.