Mac OS X 10.4.4: Don't use SU, please. As has been revealed to me shortly before the keynote today, Apple will release Mac OS X 10.4.4 through Software Update today. (Update 00:19h: It has now...) However: I urge you not to update until the combo updater will be available, and then use that one instead. It's generally viewed as safer, and also you'll have the updater at hand for other machines that need updating or if you want to reinstall Tiger.
Update: The combo updater is now available from this page. As anticipated first by our site, 10.4.4 made it into its thirties: 8G32 is the build number, whereas most other sites were predicting the update would be released before Christmas. - posted by Patrick Armbruster @ 20:52 [article link]