I stated above that I had gotten the BSoD after 10.5.6, but I'm not so sure anymore.
The "BSoD" was a bit different, the sound stopped abruptly and I got to do a crash report after report.
After reboot I played FlatOut 2 for a long while, then moved on to Spore for a good while too. Not hours of gaming, but yet.
I then rebooted into Windows and played Trackmania for a while and then Warhammer on max setting. Fans blazing throughout, but no BSoD.
So no classic BSoD yet, before the patch I would have gotten it by now for sure.
Now, after the firmware patches I didn't actually run Windows to see if the problem was still there, I just ran FlatOut 2 which promptly crashed, so didn't bother to switch to Windows gaming.
So in a quick conclusion (for now), there might be changes in 10.5.6 that makes the BSoD occur in a slightly more "controlled" way, maybe also more seldomly.
The one crash I got wasn't a classic BSoD, it was mutated. Please pay attention to this from now on, when you report here.
I'll keep testing.