WordPress 2.7 final version released today which brings complete new admin interface. The most important features are drag and drop dashboard elements, quickpress for posting quick posts, threaded comments, paging and the ability to reply to comments from the dashboard, sticky posts and plugins can be downloaded from wordpress.org with a single click.
I have posted earlier WordPress 2.7 beta release features with screenshots. This is a major release for wordpress and it brings some cool features to the table. You can download the release from here.