If you get your 9800gt working perfectly in Snow LMK your method!

I got it enabled through DSDT and for some reason, switching between spaces is noticeably choppy.

I also have an initialization issue/display sleep issue. It only arises when: The display is about to sleep and before the monitor even finishes going into standby mode, quickly move the mouse to wake it up, and I get this grey static image for a few seconds or more.
So only in this instant does it happen, maybe with Chameleon's vga rom injection this could be fixed? I should look into that.