I tried to install the Combo Updater this evening, and was given an error message that the installation failed and that I should contact the manufacturer. Hm, who knows what that's about.
Disk Util Verify Disk was fine.
Some permissions were weird, but I've NEVER had no permissions issues, so I don't know whether they are ever all in order. I don't usually care that much.
I guess I can try again. This Snow Leopard caper seems a bit dodgy to me, after having used 10.4 on a PowerMac for many years.
EDIT: Tried again. "The Installer encountered an error that caused the installation to fail. Contact the software manufacturer for assistance." Eh.