Ok, so I just bought the iPod wireless bluetooth keyboard and tried to set it up with the newest leopard (343). Sadly, pairing did not work. After I typed the numbers on the keyboard, and pressed return, the little progress thing kept on spinning. Then, I clicked the updates on the CD that came with the keyboard. These rendered my bluetooth useless. Of note, I have a kensington adapter.

Edit: i just tried this on my laptop (built in bluetooth) and it worked...hmm. Can I move my built in card from a powerbook to a powermac g5? How can I fix my bluetooth drivers in the g5?

Depending on the model Powerbook you have, it may be on your Airport card.
What you really need to make sure is that if you want to go that route that both your Powerbook and the PowerMac have the same network card slots.

You could also just go to Apple's website and buy the bluetooth+wifi card for the PowerMac.
If you have a later generation PowerMac (like one of the Quads), I have heard that you can use the new Mac Pro card (Bluetooth + 802.11n) in your PowerMac. Have not tried it, but a colleague of mine from work claims to have done it in his home PowerMac.

Trust him, but haven't seen it for myself.

I may just wait for the next leopard build...cause with this one, my airport in my powermac g5 (dual not quad) does not work...