I used the MacAirkey wireless keyboard to do this on a Powerbook 3400 I converted into a jukebox, Basically you plug the reciever into the ADB port and use a universal remote to learn commands from the keyboard, Tab, Spacebar and arrow keys etc., there only a few you need. Here is an auction for the keyboard I'm talking about

http://www.mac4sale.com/auctiondetails.php?id=100165

Never heard of this site before though so Caveat Emptor so to speak...

Here it is again...

http://adzoox.com/ad/kimages/alumkey.html
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PB G4 15" 1.2ghz - Pismo G3 400 mhz - iBook G3 500 "Jukebox"
"SawSmurf" G4 500 - Quicksilver G4 Dual 1ghz modding...