I'm seeing the same thing on my new 2.3GHz 17". I don't have a solid STR[1] but it happens fairly frequently. First time I noticed it was while surfing around in Firefox while Aperture was busy processing a few large imports in the background. Today, playing Portal (I never did finish the game) has been really annoying. Some interesting observations:
It seems like "sneaking up on it" matters. If I go from idle and cool to working hard, it seems like the fans don't spin up fast enough and we're headed for a lockup. 92-93C seems to be the danger point.
It's harder to reproduce with the machine sitting on a hard surface, but using it as one would normally use a "laptop" makes it worse. (Yeah, yeah, spare me. Making the argument that the machine sitting on a soft surface is not 'normal use' is pedantry beyond reason.) Note that I said "harder"; the first time I hit the problem with Aperture + Firefox the machine was on a hard surface.
iStat Menus' "fan control" does seem to make the problem worse, but I've had the problem with iStat Menus installed, installed but fan control disabled, and not installed at all.
SMC resets have no affect at all.
I have
not been successful reproducing the problem by following the steps suggested in this thread. Running multiple instances of yes > /dev/null with Phootbooth open didn't trigger the freeze, nor did compiling Boost (though I use Homebrew, not MacPorts). For that matter, the first thing I did on this machine was benchmark compiling Firefox, and that went fine.
Honestly, Portal has been the most reliable path to a freeze.
Just the same, this isn't acceptable for a machine in this category. It's clear from both the fans and the long charge time/'Not Charging' that this machine is willing to burn a lot of power to do hard work when asked, but falling over dead playing Portal is Not OK. The 2.8GHz C2D (Mid-2009) it replaced never spun up the fans as often, nor gave up on charging like this, but it also kept running under heavy load.
I'll call Apple tomorrow just to document the issue, but I suspect a real fix is a ways off, be it hardware, firmware, or software.
[1] Steps to Reproduce. I work for Mozilla, and spend a lot of my day job filing bug reports.
Message was edited by: Zandr - Incomplete thought.