I ask because I just bought an Asus P5N7A-VM MB, which is basically the same Geforce 9300 chipset the new Macbook uses and would like to give it a go.

I suppose I might have to wait for 10.5.6 to come out and be integrated into an install package...

Since its primarily a HTPC box I am interested in this special builds ability to use Hardware decode of H.264 material.