2 way pager alarm
lojack
zoombak or similar device
IMO, buy a bike that someone WANTS to steal. Put lojack on it, leave the key in it, and help the world get rid of criminals. Also, get a 2way pager alarm system with a silent local alarm so that when it does move, the remote gets a message.
With a zoombak device, you can set up zones that alert you when you leave or enter a certain zone. With that, you could seriously catch some thieves.
