It's a bit more tricky, as you have to replace some hardware. MPEG decoder has to be replaced with a unit that does MPEG-2/MPEG-4/VC-1, plus you have to be able to read the new disc formats (and the old).

Firmware updates galore.

I don't think it would be practical from a $$$ perspective to update a G9x to Blu-ray or HD-DVD but I've been known to be wrong.

Surround Music Fan/Computer Geek/Curmudgeon in training.
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861v4, HD621, Panasonic BD-P55K, Toshiba HD-A35, Oppo HD990, Dish Network 622, Pioneer DV-668AV-S w/ DVD Upgrades mod, EW Fontaine II (x5), Velodyne DD-15 (x2), Seymour AV Ice blocks (x7)