After installing Microsoft's Debugger tools, the cause of the Blue Screen of Death issues waking from standby appears to be the 1394 Firewire driver. Scanning Google for driver issues, it seems that there have been a lot of people who cannot get Firewire (especially FW800) to work right in Windows with Boot Camp. The driver installed here appears to be from Microsoft. I don't know if Apple has/had a driver at some point and whether the SP3 update overwrote it or anything, but I just installed the 3.2 version of Boot Camp and it didn't update it or anything. I don't use FW in Windows, just OSX, so maybe I can just disable it and see if that restores standby (unless there's a newer driver somewhere).