The Drupal 6.0 release contains many improvements, both to the core code and in usability. I've setup up a development web site and will we testing modules as their new 6.0 versions are ready. Once there are stable releases of the the modules need to run most web sites, I'll start offering existing Drupal sites the opportunity to upgrade the the newest release.
If you'd like to see a complete list of the new features in Drupal, you can visit http://drupal.org/drupal-6.0.
