Crazy? Desperate? Yeah, but it seems like the only reasonable way to get Bluetooth on a PB G4. Here’s how to install internal BT in a PB 15-inch 800 MHz:
http://www.macitynet.it/immagini/servizispeciali/bluetoothinsidee/Do you want a better solution that works with new 1GHz TiBook and Digicom USB adapter?
http://www.macitynet.it/macprof/tutorial/bluetoothinside/indexe.shtml