Please Zep, add this kext to rev.2
http://forum.insanelymac.com/index.php?act=attach&type=post&id=23806

It works for me!. Solve disk problems. I dont try with sata disk, only ATA, but, before kext install,I cant see my second disk, ATA too (with Windows XP), and THEN, I can write and Read with no problem, and I have +40mb/s data transfer, before only 1mb/s (4 hours for installation 10.5.1 )
thank you! and sorry for my English. Zep, if you want, I can test rev2 for X200 and SB450.

More information here: http://forum.insanelymac.com/index.php?showtopic=47944&st=280
PD: Motherboard: MSI RS482M4-ILD (X200 - SB450)
PD2: maybe this kext solve SATA problem too!!! Test it!