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Niner since 2006
Radius: What. How. Why.
Can't remember where I read this, but apparently the ribbon element is not WPF based. The rest of the UI, including the window chrome, is WPF though.
Office UI - New Licensing Story
What? No link to Jensen's blog!
Jensen Harris (the GPM in this video) has what I consider one of the best blogs out there. He covers the full life of the Ribbon, with excellent explanations of the features, and why they came about. Check it out here,
For new readers of his blog, he recently posted an "index" of his posts,