After one year of work with a focus on improving the theme system, internationalization, logging and usability, and re-writing the menu system, drupal 6 is released with over 1,600 resolved issues evident in major usability improvements, security and maintainability advancements, friendlier installer, and expanded development framework. Drupal 6 now includes OpenID support.
For a quick video tour, check out Greg Knaddison’s “New features in Drupal 6.0 screencast”. Find a list of good reasons to upgrate to Drupal 6 in the release announcement.