If you've got a Windows 7 test disc laying around, why not install it on your new MacBook Pro using Bootcamp? That's exactly what this person did, and without problems might I add. Video after the break. Click here for first picture in gallery.
Using Bootcamp, we did a clean install of the new OS over Vista, which was already running on the system. We couldn't just upgrade because the Macbook wasn't running SP1.[via Engadget - Gearlog]