I create a 2010 section on my Tip index page with the first pages about 2010.
Load different RibbonX when opening file in Excel 2007 or 2010
Download to find the names of the Excel 2010 ControlIDs (819 kb)
Backstage view in Excel 2010
I not say they are good but this are my first examples that I want to share.
If you have useful content or have links to articles about 2010 please post them.
And a PDF article on MSDN is published :
Creating and Sending PDF Files from Excel 2007 and Excel 2010
Merry xmas and happy new year
Regards Ron de Bruin