1. Install the Palm Desktop software that came with the 650 and when prompted use the same username as the TX. Of course you can't use the TX anymore on that computer until you change the username for that device.
2. IR - Beam everything over - cumbersome but effective. You can pick up Filez as freeware from all of the palm software sites and then go through and start beaming over Contacts, DateBook etc - beam the whole file not just a single name or event.