Here are some pointers for developers who plan to make games for Windows Phone 7 devices and submit them on the marketplace
ZuneHD has got potential for 3rd party apps if only Microsoft opened it up for them and sold the device in more countries.
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.