my wife who is very proud of her new bike, and has to leave it at the local train station is always looking for these sorts of things, she already has 2 locks, one a silver standard, anyway she has just sent me a link to this company, and it actually looks quite a good idea.
http://www.bikeshepherd.org/

basically they record all the details of the bike, and you can buy some anti tamper id stickers.
only problem i can see is that will not save wheels, forks etc unless they are marked up as well.

anyway thought i would post it up.