Besides fixing plenty of little bugs, the major enhancements most notable are probably the fixes to the feeds, the greater flexibility for comments and previews (new tags and new attributes) and the custom error-pages.

File download

Zip format.
File size 272 kB | Created
File download

Gzip format.
File size 231 kB | Created

Here is the changelog (changes since 4.0.1):

Comments are welcomed in the forum thread.