I was telling someone how to get this working in a temp fix on IRC earlier tonight for this same card, was it you?

If so, grab the 10.5.5 kexts from the NVKush Complete Package and install those, add your DeviceID to those and the card should then work. You're the only one I've seen with an issue for the 6x00 series, so I can't safely say that Apple is phasing out that line of cards along with the 5x00 series in 10.5.6.

Make sure to hold onto that package itself (mount the ISO and copy the install package for NVKush Complete to a safe place on your system), as it will be modified to remove all NVKush packages from the ISO as per Diabolik's request in PPF3 and renamed to something else. The new version should still work for you with the same method, but minus an injector, requiring you to pick another one instead of nvkush automatically being installed.

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Mac OS X Leopard 10.5.8 (9L30) | Chameleon 2.0 RC3 | Intel Pentium 4 3Ghz 800Mhz FSB HyperThread 1MB L2 cache SSE3 1MB L2 cache works, cosmetic display of 512KB L2 cache | Asus P4V8X-MX VIA Chipset, VIA-VT8237 Southbridge | AC97 VIA8237 | Dual 1GB 333Mhz DDR SDRAM | nVidia PNY GeForce 7600GS 512MB 8x AGP DVI/TV-Out/VGA [NVinject 0.2.1; QE/CI/QuartzGL/Rotation] | Darwin Kernel Version 9.7.0: Sun Jun 14 20:48:28 IST 2009; Voodoo 2.0 Intel alpha3 :xnu-1228.12.14/BUILD/obj/RELEASE_I386 i386