if you got a ppc mac DONT upgrade to flashplayer 10 as it try`s to claim the processor for itself and the ram too
flashplayer 9 is far better , it even works on my iMac g3 so i can watch youtube videos , apart from the ones which need flashplayer 10
its not adobe alone who makes this crab programming , i found over the years that programmers took less and less afford into making programs that use as less resources as possible , years ago programers had a bit of pride to make programs that could run even on older computers but today it seems like there had been no computers invented until 2007 for them