Not gonna lie, I bought the OEM Vista x64 Home Premium and I don't plan on spending any hard earned (in this crap economy) cash on Windows 7 until I see some noticeable gaming performance increases or something else big. As of now, I installed the newest RC from the M$ website and it just looks OK to me, doesn't seem different visually or performance wise but then again I have a 3.8GHz Core 2 Duo 4GB RAM and SLI 8800GT so Vista was never an issue.
I also am NOT a fan of the way you minimize windows in W7. I hate how they all clusterfook in to the little icon like if you open several Firefox windows and minimize them they pretty much disappear and you have to hover the dam mouse over the small Firefox icon and wait for a "live view" popup and THEN decide which window you want based off a small picture, THEN click on it. I like having crap in my task bar when I minimize it, not hiding inside an icon in my task bar. I would imaging I could change that functionality but to me its lame as-is.
Basically I am mad that I spent moneyz on Vista and they come out with Windows 7 a small amount of time later, patting themselves on the back for such great turn-around time....