Back in the good old days when I was working as a hardware techie for a computer firm, we were beginning to see styrofoam inserts in computer boxes - the idea behind it was to create a 'wind tunnel' effect, with fans at each end forcing a 1 way flow through the tunnel over critical components. It seemed like a pretty logical idea at the time, but then again, the heat-sink added memory did too and it failed miserably. My question is, if you've seen one of these systems out there, did the styro actually do its job, and if you own one, have you ever had any serious heat issues?

Thank you for satisfying a curious mind.