I haven't installed Mac OS X 10.5.3 yet and now we have Mac OS X 10.5.4 that fixes a few security issues as well as bug fixes in Airport, iCal, Safari, Spaces, Expose, etc. Now instead of seeing the Mac OS X 10.5.3 Update I have a Mac OS X Update Combined item which combines both the 10.5.3 and 10.5.4 updates. I guess I should install it sometime today.
You can get the full list of updates from Apple Support here.
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