Leopard installed perfectly and I got QE/CI OTB and res change...my Graphics card doesn't have a fan, it is Silent Pipe and after a minute or two it heats up to the point I cannot touch it for more than 5 seconds...
is this normal?
Could this be damaging to my graphics card?

I hope you have some decent air-flow through your case. The GT can run a little warm especially when it's always running in "3D mode". In the OSX Desktop (or using Vista aero) it'll be running in that mode... Note that the "GPU slowdown temperature" for the 8600GT and GTS is 125C (not farenheit - celcius... that translates to over 250 degrees F ) - so it's built to run at fairly high temps. Still, anything much over 70-80C makes me nervous. You'll notice artifacts and/or pixelation if it starts running too hot. With my fanless Gigabyte cards, I make sure the case has plenty of airflow and I try my best to pull cool air past the video cards heatsink.

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Running both 10.5.8 and 10.6.4 on my stinking AMD/ATi machine...

I installed V@#ista and Ubuntu Linux on my PC and the 8600GT does get pretty hot but nowhere near as hot as it did while I was running Leo...so I guess I'm back at HATING windows but USING that damnned OS all over again...
It's a damn shame though, I'm somewhat of an OS FREAK, meaning that I will try to get the best possible OS and I have tried like a million Linux distributions and of course windows. Leopard seemed to have it all, it has the speed, superb looks, good file management, apps and absolutely amazing resource management, but I can't risc overheating my graphics card...

All I can say is Thanx Zeph, it's been an Experience working with Leo....

I would suggest installing some fans blowing directly on the card, or simply diable QE/CI

disabling QE/CI is definetely not an option...

1.I love QE/CI
2.Without it I cannot play any sort of video and most of my videos are in 720p (.mkv)
3.Some apps don't run without QE/CI like vmware fusion - numbers - pages

I have a pretty large fan that blows directly above my card, doesn't it have any effect?
and also my power supply's fan blows directly on the graphics card. Is that air supposed to be hot or not?

Also is there any way for me to find out the card's temperature?
I tried istatpro and Hardware monitor but there was no Graphic card temperature indicator

I don't quite get your case setup... The power supply blows air INTO the case? It doesn't suck air IN and blow it OUT the back of the case??

Your "pretty large fan" above the graphics card exhausts? (blows OUT the back of the case?)

I build Home Theater Computers so I'm fairly obsesive about cooling, airflow, and noise. That's why I use fanless graphics cards. I've learned that "just adding fans" doesn't always equal better cooling.

Your case needs to have a good airflow scheme in order to keep everything cool. In a "tower" case, that means it needs to pull cool air in (hopefully from or near the bottom front), make it flow PAST the heat producing components, and get the warm air OUT of the case (usually at the back as high as possible - thats why most power supplies are mounted at the top rear of the case AND they usually EXHAUST air (pull air through the PSU to cool it and blow it out the back to get it OUT of both the case and the PSU...)). If you have an HTPC style case it gets a little trickier.

Oh, air coming out of the PSU WILL be WARM - generally you don't use that air to cool other things off...

edit: forgot this: Unless you've lost all feeling in your fingers, if the temp of the heatsink is much above 125-130F (low 50's C) - there's NO WAY you could keep your finger on it for 5 seconds without getting burned. The heatsink will be cooler than the GPU core, but if the core was running 80C the heatsink would probably be 70C - 70C is about 160 degrees F. 160 degrees F would burn your finger in a second or two... Slowdown temp for the GPU core is 125C (260F), which would burn you just looking at it ;-)

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Running both 10.5.8 and 10.6.4 on my stinking AMD/ATi machine...