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.
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.