I upgraded my PowerBook G4 to [OS X “Leopard”](http://www.apple.com/macosx/) yesterday. (Thanks, Kasandra!) Looks pretty cool, but one of the first things it tried to do was auto-update to 10.5.1. The system would present a “You must restart to apply this update” message, but upon restarting the system would hang while displaying “Configuring Installation”. After three attempts (and concomitant reboots) I finally gave up and asked Google for help. It turns out that there is a (much larger!) [“standalone” 10.5.1 upgrade](http://wsidecar.apple.com/cgi-bin/nph-reg3rdpty2.pl/product=16133&cat=60&platform=osx&method=sa/MacOSXUpd10.5.1.dmg) available from Apple’s [Mac OS X 10.5.1 Update](http://www.apple.com/support/downloads/macosx1051update.html) page. This did the trick, so now I can actually start exploring Leopard!
The best new feature I’ve seen so far is the [Cover Flow view in Finder](http://www.apple.com/macosx/features/finder.html), a very slick way to browse your files!