The move is possible because I just bought mhaithaca's old 12" Powerbook G4. It's a perfect size to use at the roll-top, and supports OS X and all the software to which I've become addicted. Which means that step number two is installing the Treo 650 version of the Palm Desktop suite. The phone is going to be the simplest way to keep the address book and calendars in sync on the two computers, since I don't have a .mac account.
Ah. time to restart. :)