Would it be possible to flash an nvidia geforce 8800 gtx

I know a flashed 7800 gtx is available for a late g5, but wondering if an 8800 gtx can be flashed to do the same.

Not possible to flash because there's no open firmware image to flash with. You'd have to write the FCode from scratch. And since the 8800 is a different generation from the 7800 for which a rom image is available, the changes in the rom will very likely be non-trivial (i.e. not just changing some ids).
However, I've recently read that the hackintosh folks are using so called Injectors in order to use normal PC cards without EFI firmware. As far as I understand, the situation is very similar to using a PC card in a g5. You'd lose the OF screens, but once the OS X driver gets control, it should be business as usual. I'd be interested in hearing whether anyone has pursued this strategy on the ppc macs? 

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