I've been trying to install FreeBSD on a box with an ICH9 chipset to no avail. FreeBSD-CURRENT (the soon to be 8.0) doesn't seem to work either. There has been discussions in the mailing list that it works with FreeBSD-CURRENT, but it really doesn't work on my box.
NetBSD seems to support ICH9 on 4.0, but I prefer FreeBSD over NetBSD. Oh well, I'll just download the ISO and see how it goes. If it works, then I'll try to replace the kernel with a Xen hypervisor. Our box has a whooping 250GB of hard disk space, and it's more than enough to run a few domU Linux systems. Hmmm... It'll also be an opportunity to run Plan 9 domU as well. I haven't tried that yet. I'm wetting my pants with nerdish delight now.