Check out IRTrans. It's a usb IR receiver that works with about all remotes, even tv/cable box remotes. You'll want to use iRed with it. Another great utility is "Remote Buddy" it will work with Ipod Touches, iPhones, Bluetooth Phones, WindowsMCE remotes, and even Wii controllers. Remote buddy also allows amazing customization to the Apple Remote, and full computer control with just those 5 buttons.
PS: Nightfly is correct Mira is your best choice for an IR receiver for the apple remote.
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