Hey Paul,
Sorry to second Raphael’s bad news, but what you need to make this work is an Intel based Mac. I’m not certain that Leopard is a requirement, but he may well be right about that as well.
Assuming you’ve gotten FCP 6.whatever to run on your iBook then you may be able to get the Log and Transfer functionality for EX footage to work from within FCP and forget about XDCam Transfer. I haven’t personally played with that workflow and I’m still using XDCam transfer, but it’s worth checking out as it may be your only option without changing hardware.
That said, if you can afford a MacBook Pro (or Mac Pro) you should make the jump. I personally can’t imagine working with that footage on a G4.
My $.02
Zak
“You can’t fix coverage in post.”