Drupal 4.5.0 is now officially available. New features: Tab based user interface, Configurable menus, Multiple roles per user, Document/image uploads, Node-level permissions, Improved locale support, Anonymous comments, Theme system improvements, Customisable user profiles, Usability improvements, Configurable input formats, Performance improvements.
For the occasion, Drupal.org is now completely redesigned.
See it all on Drupal.org.