Matt's posted about the redesign of the WordPress blogging tool admin tool redesign, which has been worked on and integrated overtime into WordPress after usability testing:
Khaled has drawn back the curtain on Shuttle. It’s a fantastic set of work by an exceptional group of people (Khaled, Michael Heilemann, Joen Asmussen, Chris J Davis, Joshua Sigar, Bryan Veloso). There are some pretty significant shifts in there so it’ll be integrated incrementally rather than overnight, and I also plan to test out things on WordPress.com first and watch usage to make sure none of our assumptions are too far off, but I think it’s safe to say that this is a pretty significant milestone for WordPress and we have some exciting months ahead of us. Everyone should thank the Shuttle team. (Note: There will be some ongoing design work as well, especially as new features are added to WordPress. If you’re a kick-ass designer who can juggle code as well as Photoshop, drop me a line.)