... using a cable with a mini jack on the headphone output of your computer. The other end of the cable will require a left and right RCA plug to connect to the audio input on your NAD receiver (the red and white stereo plugs you may be used to seeing).

You should be able to purchase this cable at any Radio Shack for less than $20.

If you want to go wireless, you can purchase the AirPort Express Base Station with AirTunes... but you will still need the additional cable to connect from a headphone jack to the left and right stereo plugs, which apple will sell you for $40.

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grim