Like Damnesiac, I am also suffering from the low OpenGL/Quartz scores on my 8800GT. I am using NV/Geforce kexts from the first 10.5.2 beta. Damnesiac, I think we just have to wait for the official 10.5.2 update (or get ahold of one of the newer betas). Here are my scores:

With disk:
<img src="http://i38.photobucket.com/albums/e113/agrafuese/disk.png" />
Without disk:
<img src="http://i38.photobucket.com/albums/e113/agrafuese/nodisk.png" />

Leopard 10.5.1 Zephyroth Rev1
Board: ASUS A8N-SLI Premium nForce4 Chipset
CPU: AMD Athlon 64 X2 3800+
1GB Corsair DDR400 Ram
Video: eVGA 8800GT 512MB
HD: 300GB Seagate IDE