Havent had any graphical problems using dsdt for 8800gts. with SL QE/CI no longer shows up in system profiler. EP35/P35 should be very similar, same chipset. EP35 is supposed to be more energy efficient.

As far as sleep on idle. Mine works but.... It takes exactly five minutes after the display goes to sleep before the system sleeps. So if I set it to go to sleep in 1 hour, the display sleeps in an hour. But the computer stays on for an extra five minutes, then goes to sleep. No big deal to me though.

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GA EP35-DS3P - Intel Q9550 - 2 X 2GB Dominator 1066Mhz, EVGA 8800GTS 512MB
2x320Gb SATA in Software Raid 0, 1x1.5TB for Time machine and storage (Geekbench 6293)
10.6 Retail 64bit Using DSDT for audio-889a, video-8800gts, ethernet w/TM fix, USB fix, and SATA fix.
MacBook 2,1 - 10.6 Retail
MacBook 3,1 - 10.6 Retail