Did Snow Leopard aggravate heating problems?

Since installing Snow Leopard I have noticed the following on my otherwise perfectly functioning MBA:
1) Temperature is constantly at 50° even when idle,
2) A few minutes of YouTube and system becomes unstable and unresponsive, with fans kicking in at full blast reaching temps of 70-80°C.
Prior to the upgrade, temps were much lower and I never experienced a single core shutdown.
I was wondering if anyone had the same experience.

Hi Felix,
I figured both of your topics (posted 2 minutes apart) could probably just be answered in one thread. I've upgraded both of my MacBook Airs (1.6GHz/80GB Rev A & 1.86GHz/SSD Rev B) and have noticed no change in day-to-day system performance, cooling/overheating. I've done all the usual "testing" in running YouTube, launching Parallels, playing a game or two and stressing the CPUs in software generated stress tests.
YouTube was always a bit of an issue for my Rev A, from day one. I've always contributed that to the Intel GMA X3100, I find the my Nvidia 9400M machine handles a lot of the struggles found in the Rev A. Unfortunately, a lot of the GPU features of the new OS do not include the Intel GMA X3100 (only the Nvidia 9400M). The Rev C models that I've used/tested are behavior pretty much the same as my Rev B as "under the hood" they're the same machine... just cheaper in the MSRP category.
So no... I wouldn't say Snow Leopard is the problem, at least not inherently with the MacBook Air. One thing you might want to try is running Safari in 32-bit mode, as I noticed when it came to flash intensive pages that Safari was using a lot more system resources in 64-bit mode (when translates into heat, CPU load, etc.). You can toggle Safari by doing a "Get Info" in the /Applications folder on Safari.app and checking the "Use in 32-bit mode" box.

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