The installation went fine. At the initial startup, my display calibration software (Eye-One Match) produced a message that it couldn't find my custom profile. I re-calibrated the display (a 5-minute job) and all seems well. I'll post back if and when I find anything else. As I write this, 10.6.3 has been installed for about 30 minutes so it's too early to tell anything else.
I'm happy that my penguin friends can now get the correct time on their Macs.
