I have Windows Vista installed on Boot Camp on my Intel Mac Mini and it works fine! It hasn't crashed and I have had no problems with it. I don't see why everyone, even people who have never used it before, says that Windows Vista sucks. I guess on a PC it might run slow or something, but it works great on a Mac. Here's my setup:
*UPDATE 11/9/2009*: Just so you know, my computer rating or whatever isn't 1.0, I took this screenshot before I tested it. I also sent an email to Chris with our thoughts on Vista and a link to this page. I'll post his reply.
I have a Mac Mini and I'm fine with my memory. I got the 1GB for a reason: it's cheaper. I don't use Vista as my primary OS, just for Windows apps and gaming and OS X works fine.