I just did the same thing with my HT! Give Bill at homeautomationnet.com a call; he'll hook you up with a starter kit to get you going. Once you have the X10 dimmer switch installed, the IR to X10 transceiver placed somewhere near your equipment rack, and program the light switch (all included in the kit);just program a macro on the DVD Play/Stop button to dim/brighten the light(s).

Don