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The new Ribbon UI is from a group known as In2Hyperion (In-to Hyperion, get it?). I had read a few things on their blog at http://www.in2hyperion.com in the past but took a closer look when I heard about the Ribbon UI. I looked at the authors of In2Hyperion and I know a couple of people on the list from their days at WhittmanHart (now part of TUSC/Rolta). I downloaded and tried out the Ribbon and, in my limited testing, I found it very useful. Below is a screenshot of the Ribbon; click on the picture to see a larger version.
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Their blog post that discusses the Ribbon, and has installation instructions and a download link, is at http://www.in2hyperion.com/post/2010/03/21/Hyperion-Excel-Add-in-Ribbon.aspx. Thanks to the In2Hyperion team for their contribution to the Essbase community. Hopefully you will find the Ribbon UI useful too.