While getting all of this together, it hit me that I have a PS3 Bluetooth remote sitting in front of me. I've successfully paired a PS3 Dualshock 3 controller with my Mac to play games, so I figured maybe the remote could be used to do HTPC stuff on my Mac. It looks like folks have hacked together some kludges to get this going, but no dice on OS X according to that page. A program called Remote Buddy seems to support it, but I'm trying not to dump a lot on this project until I rule out the Boxee Box. Pairing directly with OS X doesn't work for me, but the interwebs suggest that some people have gotten it to work -- I just get a pairing refused error, no matter what I select for the passcode. Maybe only certain vintages of PS3 BD remotes work on OS X or something?