Safari has been crashing for me every time I open it. It's mostly on sites like YouTube, which leads me to believe that it's a flash problem. When I open the page it just freezes up and the pinwheel just keeps spinning and spinning. I noticed these problems on my MacBook after I upgraded to Snow Leopard, and now they are arising again on my recently purchased Mac Pro (also running SL). I'm running latest version of SL, Safari, and Flash.