I had my pointer freeze twice tonight, having downloaded 10.2.8 a couple of days ago. I use an MS wireless Intellimouse, but it wasn't a mouse related problem. The keyboard was paralysed too (no emergency restart possible). I tried everything, but with no input device being seen, I tried to switch off. No luck there either, so reluctantly I had to pull the power cable out.
I 've had my IGhz G4 iMac since it came out in April, I think it was, and this is the first "crash". I'm really disappointed, as I had come to believe the "doesn't crash" hype.
In a way I hope it's a 10.2.8 problem, so it can be easily fixed or replaced with 10.2.6, or Panther. But as I say, it's a disappointment, and I'll be wary of Panther!