Devices with Bluetooth are vulnerable if they are configured wrongly or subject to determined attack. Here are the risks.

Two million devices a month ship with Bluetooth. Many of them are not set up to work securely, others could be subject to attacks. Last month, the first worm to be spread by Bluetooth was reported

This paper, from AirDefense, explains the Bluetooth protocol, its security features, and the potential problems including SNARF, Blujacking and denial of service attacks.

Other features:

The nuts and bolts of Bluetooth The basics explained

What do Bluetooth profiles do? How different Bluetooth devices behave

Safe Bluetoothing Advice to use Bluetooth securely