Here are two links I find particularly good:
http://www.computerworld.com/s/article/9176254/Dissecting_Microsoft_Office_2010_This quote is particularly interesting seeing as Mathcad has followed the now reversed idea of the silly orb at the top left of the application:
"the Office orb button from Office 2007 ... thoroughly confused people -- many thought it was a piece of branding eye candy rather than a functional button."
Yep - I don't liek the idea of the brand being the place you click to save and load files - and with that quick menu at the top it almost isn't needed...
To Ribbon or not to ribbon:
http://interactiveasp.net/blogs/spgilmore/archive/2010/03/25/to-ribbon-or-not-to-ribbon-considering-the-microsoft-fluent-interface.aspxPhilip
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Nobody can hear you scream in Euclidean space.