Just downloading via Software Update a 12Mb update to iTunes, and grabbed the approx 50 Mb update to MS Office earlier (use the Office Updater). Along with that Audio Hijack Pro (4.2 Mb) adds a few features, including Bookmarkable MP3s.
iTunes 5.0.1 features several stability improvements over iTunes 5, while the Office update apparently brings
performance improvements, security enhancements, and increased stability.
Meanwhile, LargeType allows you to do that Address Book Large Type thing on selected text via the Services menu. Nice, for short stretches of a few words, but doesn’t help beyond about a dozen words at a time, as they all squish into the width of your screen on a single line. Still, it’s worth a try if you just want to see a phrase or two more clearly.