Read http://home.hawaii.rr.com/tribble/Palm/#BossAlert about one great application of BlueTooth. One of the best I've seen.
It took millions of dollars to bell the cat. Don't tell him how to turn it off.
Some people have begun using the Bluetooth feature on personal digital assistants (PDA) and mobile phones for a new activity called 'bluejacking,' or sending anonymous text messages to strangers' cell phones. Bluetooth is a wireless technology designed to enable devices within a few meters of each other to exchange information. Bluejackers use their phone, or other device, to get a list of nearby Bluetooth enabled phones. They then name their phone after the message they want to send, choose a device, and the phone announces itself to the chosen device. For example, a bluejacker could name their phone 'nice tweed pants' and send that message to someone nearby. Many bluejackers practice their hobby for the surprised expressions on their targets' faces, but some believe the technology could be used for a new type of spam. People can stop bluejackers by turning off the Bluetooth feature of their phones.
Also - http://news.bbc.co.uk/2/hi/technology/3237755.stm