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On my Macbook with the GMA950 I had a LOT of issues with graphical glitches in 10.6 - And come to think of it most of them were in Safari. Since upgrading to an iMac I haven't had a single graphic problem, which makes me think it has something to do with a bug in the graphics drivers.
 
Haven't downloaded it yet. It would need a restart and it's 1.30am here so the chime would wake up whole house ;) Might hold on for few days before I do, look at what issues it has

You know, if you turn down the system volume before you restart, your opening chime will be that new volume.
 
This is an issue with Safari 5. I have it also. I submitted a bug report and am working on it with a technician.

This is NOT an issue with Mac OS X 10.6.4
 
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