Updated from 10.6.0 to 10.6.4 Everything works as it did before except sound. Xbench score went up from 147 to 159 including disc tests and seems faster. Perhaps It wasn't running 64bit before and now is? Is there an easy check for this?

Rev 2 board
E6300 2.8
9400 GT QE/CI working out the box. I think this card has native drivers. It's always worked for me and is a decent low end card. 9500 GT IIRC is also native and is a better card.
2GB DDR2 800

edit: tried the azaliaaudio patch above and it worked great. Audio is working again. Make sure you don't have any other kexts loading at the same time or it won't work.