Last year I had a couple of nice bikes stolen from my house. They were locked in the garage and taken while I was away on holiday. Found out the hard way the importance of registering bikes. The police & others request details to help recover bikes. As there is no program to register bikes here in my small town, I've been using the Project 529 on-line service. A useful site to compile the info you will need to share with law enforcement, neighbors, insurance company... I've got pictures of the bike, registration number and reciept all in one place. I also like their decal that shows the bikes are registered. If there is no city or local option for registering your nice bike, this is a great option, imho.