I don't know if it is the same kind of issue, but for me and my dual monitors setup, Aero is choppy with ALL WDDM 1.1 driver. My only solution is to install the last "WDDM 1.0 only" driver i know (182.50) for my 8800 GTS. I really hope it's a driver issue, because if it's not, well, i'll go back to Vista i guess...