Sprint finally came through with the Bluetooth Dial-Up Networking for the Treo 650. It was posted last night on Engadget but waited until this morning to do the update.

palmOne - Support - Download & Install Treo 650 Updater for Sprint PCS:

The update went fairly smooth, other than the normal Now Up-to-Date rigamarole to keep duplicate events from occurring on our shared calendar server (which I almost botched!).