My bluetooth mouse finally arrived from Amazon. I added the batteries, clicked on the OS X Bluetooth menu to find a new device, pressed the little button on the bottom of the mouse and bingo. I've now a nice 3 button mouse with scroll wheel that works over bluetooth with my 17" PowerBook.
I had one minor concern that, moving the mouse while the PowerBook is asleep could wake it up again. This happens when using a USB based wireless mouse. However this doesn't happen with the Bluetooth mouse - which is great as I didn't want my PowerBook waking up while its jigging around in my bag.
My only minor gripe is that the speed could maybe go a touch faster - its set on max for me which is just about perfect - though I could imagine some hyper sensitive, speedy mouse users wanting it a touch faster.
Now if only they made wireless power supplies, I'd be totally free of all cables :)....