Verizon is now allowing customers to use their cellphones a broadband modem. They are supporting this on the LG VX9800 and VX8100 and the Motorola RAZR V3c and E815.
Officially Verizon is only supporting this when connecting to the phone with USB. I haven't tried the Bluetooth connection since this change, so I don't know what the speed would be. I will try it out when I get a chance.