Windows 7 is now available on TechNet & MSDN to premium subscribers & some resources on Windows 7.
Microsoft collated an ebook by MVPs for IT developers.
A new website & documents for developers on Windows 7 & software development using Microsoft products.
MSDN released new White Papers on the features of Windows 7 demoed at the PDC2008 & WinHEC.
Some links for developers to make their applications more efficient for the Windows environment.