So I've got the older PowerPC iMac (17 inch swivel screen with the half circle base) and while it has an airport card, it does not have bluetooth. I bought a bluetooth keyboard for my iPad, which I have never used. So I'm thinking about buying the magic trackpad and using the the wireless keyboard on the imac. I just need one of those USB bluetooth adapters. Now, there are several on Amazon.com, but I'm not sure which one to get. I'll only need two devices operating, so will I need one adapter, or two? I can't seem to find this info out there anywhere. Some suggestions would be fantastic! Thanks!!! Edit: is there a way to upgrade my airport card in this iMac to the 5ghz version?) I think it's the oldest airport card in existence! haha! The computer is from 2003 I believe!