2 very good sources on the Microsoft Office 2007 UI / Ribbon

While cranking on some of the Microsoft Office2007 discussions I thought it would be good to highlight at least 2 good sources who do know a lot more about the UI, it's purpose and evolution, etc.

The fist one (ofcourse) is Jensen Harris. He has done about 187 posts on the new UI which I am sure address almost all of the questions / remarks being echoed over the last few monts

The second one is Melissa Macbeth. Het blog is deicated to Tasks and Time Management in Microsoft Outlook 2007.