Today while doing some research on Bluetooth I came across two site which are packed full of information.
The first is Martin Karger's Evilgenius blog. Martin has a number of excellent posts on Bluetooth and other wireless security topics.
The second is the Bluetooth Penetration Testing Framework. This site has a wealth of information on attacking Bluetooth.
If you are interested in Bluetooth security I recommend you check them out.
Cheers,
Matt