The Inquirer has benchmark numbers of the Geforce 8500 and 8600 cards. They did have benchmarks before which we talked about here. But, now they have much more specific numbers.
under 3DMark06 at 1600×1200 4AA/16AF
8500GT got 1141
8600GT got 2483
8600GTS got 2949
The Inquirer has the full details here.