I've had a chance today to try the Wii Remote specific code on my 
iBook G3 with a Bluetooth dongle and it worked fine (although it 
displayed an error message to me that was not correct (i.e. there was 
no such error ;) - I'll have to look into that).

Something you should make sure is that you have Bluetooth enabled for 
about a minute before you try to pair your Wii Remote with Remote 
Buddy. That can also hold correct for the time right after boot. I 
don't know why this, but it definately is. I've Bluetooth turned off 
all of the time unless when I'm writing code for the Wii Remote. If I 
try to pair it immediately after turning Bluetooth on, I fail. If I 
wait for a few seconds (=> thus one minute should be safe) and then 
try the pairing, everything works like a charm.

Best regards, 
Felix