Since 1984, the National Bike Registry (NBR) has been registering bicycles in our secure national database so law enforcement can identify the rightful owners of recovered bikes. NBR now offers an easy to use registration service. Using the latest in label and database technology, bikes can be registered at this web site, by phone, or by mail.
This link also has information regarding bicycle theft, locking your bike and free printed material.

http://www.nationalbikeregistry.com/