I tried the 2.6.0-test3 with the new akpm patches. It compiled but wouldn't boot. I then just applied the nforce2 IRQ fragment patch (dated 7 Aug) from the same patch and it looked good. It actually made it several minutes without locking up. I was nearly ready to call it a success, but "WHAM", hard lock. Rebooted several times only to confirm it was still locking up.
More information about my system in case it helps to identify the problem:
1GB memory (2 x 512M Kingston HyperX PC 2700). BIGMEM is enabled in the kernel to support up to 4GB.