Just finished installing AutoCAD 2010 (though I prefer ProE and Inventor) on my Mac Pro. I also have the 2006 MP, but I'm running Win7 64. Mine was an upgrade directly from XP, and I had no issues at all installing it. Program seems stable so far, I haven't had any trouble.I am currently running AutoCAD 2010 on Win XP Bootcamp... But it is not stable and it "runs out of memory" about three times a day (even tho the system has 10GB of Ram...)
I am hoping that by installing Win 7 that I will be able to finally use all my avail. ram. Problem is that my MAC PRO is a 1st Gen model, I have heard that it can be a pain to get Win 7 64bit to install correctly.
I will post back once I get everything up and running.