Tethering is easy and with no hacking on current TM-506 firmware over Bluetooth -- just configure Network Sharing in the handset with Windows user account Username, Password and Workgroup, and make a PAN (Personal Area Network) connection from Windows to the handset (Access Point, not Direct Connection), and voila! (Tested with my Lenovo ThinkPad T41 running Windows XP SP3, standard TM-506 firmware R3DA030, and new $20/month Unlimited Web and Messages package.)