I have exactly the same problem, and I'm just stucked with it... already send a bugreport (and you Lonni answered btw). The problem is that the card autodetection fails. Watch your log, the driver says :
(II) NVIDIA(0): NVIDIA GPU detected as: GeForce Go 6600 GT
(II) NVIDIA(0): Detected PCI Express Link width: 16X
According to this
post it's a vbios issue, and the problem can be solved using nvflash to replace the bios.
Unfortunally to me, gideong's 6600 is an Inno one, and mine is a Twintech one, and all the bioses I tested didn't work. Besides, I contacted Twintech's support and they send me another bios. With it I can run X, but I get the so called "screen frozen, but mouse pointer moves" bug (and NvAGP didn't made a difference)...
But be happy, your card is an Inno3d, so you have a chance... good luck