It looks like the installation process isn’t that complicated, although it does require removing the EFI partition and then doing a repair on the install. After that, you’ll need to manually download and install drivers.
I’ve been thinking a lot about the Mac install issues. If I were Microsoft, I’d do everything I could to make Vista install on Apple hardware as smoothly as Apple got XP to install on systems via their Bootcamp beta. Apple did a terrific job to make Windows install without a htich (outside of the lack of support for iSight)–particularly considering the SATA driver problem in XP.
I haven’t tried installing the public Vista Beta 2 on my iMac, but I’m thinking about it. I need to get some more memory first. The 512MB that’s already there barely (or should I say painfully) runs Visual Studio 2005 and I can’t even imagine what it would run like under the beta OS.