After updated to OSX 10.7.1 (Lion), My MacBookPro6,2 suddenly blackouts and crashes randomly, so much frequently. Console logs just tell some memory error and kind of NVRAM error like "BSD process name corresponding to current thread: kernel_task" or "BSD process name corresponding to current thread: Window Server".

I dug information about same problem, then I found someone resolved it by a temporary way. He used an app "gfxCardStatus" which can switch integrated graphic and discrete graphic manually. He stopped this panic by using only integrated graphic (Intel HD Graphics). Also in my environment, this problem was resolved by manually switching to integrated graphic, it disabled dual display though.