I'm trying to get my gtx 260 working as well, the only thing that seems to work is the default 32mb driver. I forced it into 1680x1050 but scrolling is horrible!

I'm using iPC X-DL 10.5.6, everything is working fine except my video!

What do I need to do to update to 10.5.7 to get it working like you did?

I have:
AMD 64 x2 Athlon 3.2 Ghz Dual Core
Gigabyte Motherboard GA-M61P-S3 with MCP61 Chipset
EVGA GeForce GTX 260 Core 216 Video Card

Thanks, I hope someone can help!

p.s. I've tried the latest Netkas Injector with kext from the IRC channel, it's supposed to support GTX200 series cards and its a no go, it won't boot back into OSX.