University of Portsmouth in the UK has started tracking student's bikes using RFID tags. Students park their bikes in designated areas and then register the bike's location using a mobile phone. Before retrieving the bike, riders must call and enter a pin number. If a pin number is not called in, moving the bike will cause security cameras to zoom in on the action. Oregon State University and city of Copenhagen are starting up other anti bike theft RFID initiatives. (Found through rb.trends).