So, GPS should be ready for this, right? (Maybe not at anything like affordable, of course.)
there’s a discussion of it at Bike Forum from 2008 where we find that yes, Lojack has a service — identifiers on your bike so you can ID it … if you can find it. http://www.bikeforums.net/archive/index.php/t-419069.html
http://answers.yahoo.com/question/index?qid=20100714082507AAykSJC has some good answers from a year ago —
and http://www.trackingtheworld.com/products/ would absolutely work… but of course, don’t even ask about what it costs.