Office 2007 Beta 2 just launched on the MSDN Office Developer Center. Check it out!
Here you will find tons of new information about Office 2007. My favorite is series of Screencasts covering "How Do I" Office 2007 development and customization topics. They are short, impactful videos that walk you through these topics:
And stay tuned... Many more are on the way!
Kudos to Erika Ehrli the Office Developer Center site manager and the MSDN team for pulling this off!
And to Ted Pattison for his excellent work in producing these screencasts.