WordPress 2.4 Admin Preview: Jordan built up a mockup of the new WordPress 2.4 admin backend. Some of the features work, some of them do not. However you can still get a good idea of what it will look like in 2.4 and where the admin redesign is headed. Via Email. Also, TubeTorial has a video walkthrough of the new admin interface.
[EDIT] Please be mindful of the fact that this is a cursory glance at unfinished work on the WordPress admin interace and nothing else. Please read Matt’s comment.