you could try a pager too...i have a pager for my car. twice i've had it beep and run outside to find some asshole tryin to break into my car (in mission hill...a not so nice part of boston)...they just ran away both times as soon as me and a couple people came out and saw them.

so far the only time my car has been missing when i go to find it is when some tow company takes it cause i parked illegally or when i was a bit too fukkkked up to remember where i put it. dude, where's my car? it's happened...