I can’t remember if I’ve posted about this site before, but it’s been updated and revamped so it deserves a mention regardless.
Immobilise (Immobilize.net in the U.S.) is an initiative to help track down all your stuff if it gets nicked. You enter the make, model, serial number and upload photos. If you get robbed, you can use it to block your phone and also inform the police and second hand trade of the items stolen.
It is free, and it’s recommended by everyone from the Home Office to the BBC. Yeah, it’ll take you a while to whack everything in, but think how much easier it’ll make things than having to dig out all the information if your stuff gets pinched. They even tell you how to find serial numbers on many common models of electronic goods.