Think open source is unsophisticated? Think again. Take a look at the lengths the WordPress team went to in order to redesign the user interface.
To make sure users get a better interface, WordPress engaged the Ball State University’s Center for Media Design, Insight and Research (CMD, blessedly, for short).
CMD conducted eye-tracking studies, usability surveys, and other research to guide WordPress’s complete redesign of the user interface. You can even check out a detailed report of their findings (PDF).
Usability Testing Report: 2.5 and Crazyhorse | WordPress Blog