I was getting a strange message on screen when trying to play Castle Wolfenstein and also during the Jedi Knight Demo. It was a gray screen with a message in four languages reading:
You need to restart your computer. Hold down the power button for several seconds or press the Restart button.I did a little research and found the error to be the new 10.2 kernel panic screen. A little more reading on the Apple forums provided a suggestion to remove the Microsoft mouse and use the original one button Apple mouse. That worked, and I've had no other panics, but I thought the following article from Apple's Knowledge Base might be a good reference for others who have been having similar problems or getting this new mesage and pulling a Feiss:
Mac OS X Hints
http://hints.macworld.com/article.php?story=20021211055410135