Yikes! My new G5's Software Update panel just lit up with a bunch of updates. No. 1 are Security Updates for 10.4.5 and Panther 10.3.9; also iTunes goes to 6.0.4, iPhoto goes to 6.0.2, and Front Row goes to 1.2.1.
Check your Software Update in System Preferences for them all. As always, don't forget to Repair Permissions...I do it before AND after any significant update. I also check my HD for Directory fragmentation with DiskWarrior's "graph" feature, just to be safe...and if it's over 5% I'll sick DiskWarrior on the HD.
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What's the difference between reality and fiction? Fiction has to make some sense.