I got a USB Bluetooth adaptor which works basically, but I have not extensively tested it since I do not really have a use for it yet. I am waiting for a Bluetooth enabled printer and maybe a Bluetooth headset to really start to play with Bluetooth.
However, in order to use Bluetooth, you need to install the kernel drivers and modules (unless you have Tetsu's kernel installed) and then you can add the pan network and bluetooth dialup network components. Once they are installed, you will see additional options in your Network config applet.
Here are the files you need:
* bluez-zaurus_2.12_2.4.20_alpha4_arm.ipk * qtopia-bluetoothnetworkapplet_1.0.1_arm.ipk * qtopia-pannetworkapplet_1.0.1_arm.ipk * susp_resume_bluez_0.9.3_arm.ipk (might need this)