Hi,
I have to say, I've always though worrying about your CPU temperatures etc. was bizarre :-). I have so many other things to worry about I don't need to worry about that. Surely it's up to the machine to make sure that things don't melt down, either by design or management. Mind you, that's why I can't be bothered with building my own machines or overclocking , I rely on my computers for my livelihood and therefore use them as designed. My G5 does have a funky liquid cooling system though, even if it doesn't glow blue :-). None of my machines have ever had problems with temperature, despite all my work being processor intensive.
Actually, that's not quite true, my first Mac was a PowerComputing clone and that had a fan which failed and melted down the processor. Then they repaired it and completely forgot to hook the fan up! So another melt down. Then they lost my machine for 4 months. Sometimes I think I should have got an Apple, but that's when they were ridiculously expensive.
My Maxtor external RAID doesn't like working when my office gets hot in summer. Neither do I, my office gets very hot in mid summer so I shut everything down and do more work in the evening. The computers don't seem to mind the temperature, although their fans etc. do get going faster than usual. I usually have to shut one down just to keep the temperature in my office down! My PC adds a couple of degrees celsius.
Regards,
Jo