- Uhm.  Rewrote the module system: less code clutter, less run-time
  overhead, and a lot better (simpler) module API.  I had to edit a
  LOT of files to get this refactored but I'm sure it was worth the
  effort.

  For module writers / maintainers:

  None of the hooks changed, so 95% of the old modules should still
  work.  You can remove some code instead as "$module = array(...)"
  just became obsolete.  Also - and let's thank God for this - the
  global variable "$repository" has been eliminated to avoid modules
  relying on, and poking in drupal's internal data structures.  Take
  a look at include/module.inc to investigate the details/changes.

- Improved design of the content modules "story", "book" and "node"
  (to aid smooth integration of permisions + moderate.module).  I'm
  still working on the permissions but I got side tracked for which
  I "Oops!".