During the whole beta program, I did not experienced a single BSOD. Yesterday, I did a new OS installation, installed NIS 2011 and had a BSOD upon reboot I had another one later in the day while the machine was idle. This morning I did another clean OS install, no BSOD after I installed NIS. However, I did have a BSOD tonight while the PC was idle. According to BlueScreenView, this was the cause (which was the same for yesterday)
Maybe it's not NIS 2011, but it's a bit much of a coincidence 