I thought, obviously foolishly, that the HDMI A/V pack for the xbox would let me connect my xbox via hdmi. no. it's just a cable, with an audio-out widget. It doesn't give you hdmi capabilities on a device that doesn't already have an hdmi port. Which I would have realized, had I read the teeny tiny print on the back of the packages.
So, I just spent $50 on an HDMI cable that I don't need and can't even use (and, due to the nature of the packaging and the heroics required to open it, I can't return). Awesome. Thanks, Microsoft.