A member at the OSx86 Project Forums has finally gotten Windows Vista to fully install on his Intel Mac. There are still a few glitches, but he's posted his instructions along with several screenshots.

OK I managed to come to the same basic conclusion as some others that Vista was exploding because it didn't like either the way OSX partitioned the drive or that it wasn't the main partition. I haven't looked deeper into it yet. Anyway I went through the basic steps of installing bootcamp, the firmware, etc and then started the install. When you get to the section where it asks where to actually install vista....well here's the main problem...you delete all of them. Even OSX. Yes this isn't a dual boot solution (yet anyway) but it does allow vista to run.

Things I noticed: The drivers CD that apple has you make doesn't work. It starts installing, gets to about where it starts installing various drivers, installs the video ones, and then goes stupid, rolls back the changes, and says it errored out. I haven't tried to extract the MSI that has the driver packages so that I can manually do it yet. Also I installed the ATI Beta vista drivers and even though they install fine I don't get glass and 3d stuff explodes in my face too. I thought I read somewhere that someone did get glass going but I haven't yet.