It seems that Lion/Bootcamp will not allow any Windows version to be installed unless it's Windows 7........QUOTE]
Hello! I've seen a few articles floating around saying this as well but its completly Untrue!
I just installed Vista Home Premium via Boot Camp on OS X Lion.
Instead of creating a "newer Windows Support Driver Disk" (which I did, but it failed!!!)
I just inserted the "Mac OS X Install DVD. Mac OS version 10.6.3 Disk Version 1" that came with my 2010 Mac Mini. Boot Camp did the rest.
Bingo! All is good.