Drupal 6, now more than ever
For those who haven't really been following it, several hundred contributors, 13 months, and tens of thousands of lines of code have gone into making the only version of Drupal ever that is better than Drupal 5. So, naturally, we've released it and called it Drupal 6.
Drupal 6 boasts a boat load of new functionality, ranging from Ajaxy yumminess throughout the system to native support for OpenID to vastly enhanced multi-lingual support. Several entire subsystems have been either overhauled or totally rewritten to proivde more power, flexibility, and speed. The official press release has the complete rundown, or for the more visually inclined there's a new features screencast. For me, though, the new theming system is feature numero uno.