Edit:
Video can be seen at http://buytaert.net/usability-usability-and-usability

The university of Minnessota and the University of Baltimore have both done usability studies on Drupal 6. The University of Baltimores study can be downloaded here (found it through Dries Buytaert's blog):

http://groups.drupal.org/files/DrupalUsabilityResearchReport.pdf

Nick Lewis has a few suggestion based on the above study:

http://www.nicklewis.org/node/973 

One of Nick's suggestions is that more buttons be used. I do particularly like the suggestion as it leaves one less click for users who want to save the blog post instead of just publishing it Kudos/+1 to that idea:

http://www.nicklewis.org/node/973#comment-51795 

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