I think Safari runs better in 10.6.2 than it did in 10.6.1
At least I read that there were several Safari tweaks made. I don't know first hand. It might take a couple more updates to get everything ironed out.
Folks, there is no 10.6.x for Powerbook which uses PPC processor.
OP - try uninstalling Flash Player completely ( http://kb2.adobe.com/cps/141/tn_14157.html) and reboot, permission repair, reinstall the latest flash player and repeat the permission repair - this *may* fix the problem *if* the problem is flash related. [Do all this after you Quit all browsers.]
If that doesn't fix the problems, post some relevant lines from the Console log (Applications--Utilities--Console) and someone may be able to help.