October 19, 2013 Update: The links to the Autodesk website no longer work for me, so I assume that the AU Tech Talk content has been taken down. I have posted the contents of my article on putting AEC Content on the ribbon in this post.
The December 2009 Edition of the AU Quarterly Newsletter is out. If you do not already receive the newsletter, you can do so by becoming a member of the AU Online site and requesting the newsletter in your profile, under the Preferences category. This edition includes a link to an AU Tech Talk article I wrote about accessing AEC Content from the ribbon. I had a chance to look into this topic more deeply since I last blogged about this topic.
The article is a fairly detailed tutorial (with pictures!) on how to customize a CUIX file to add a ribbon tool that "runs" a tool palette tool, enabling you to add your own custom AEC Content to a ribbon tab. You can access the AU Tech Talk page and look for my smiling face,or go right to the article (sorry, there is a picture of me there, too).