A fix for a fairly major security problem, removal of "View a list of all items" from the Add A New Article option (since that command doesn't exist anymore), fixes for some archives.php bugs (namely making it connect to the database), a headlines view fix, and some minor changes here and there.
A new fully-featured comments system, an advanced archiving system, use of the MySQL function PASSWORD() to encrypt passwords instead of PHP's crypt(), changes to the admin menu, many code optimizations, and many new configuration options.