I see over on the Windows Phone Developer Blog that the UI Design and Interaction Guide for Windows Phone 7 and Design Templates for Windows Phone 7 are now available for Developers. The UI Design guide is actually a very interesting read, even if you are not a developer. I am getting so excited for the launch of Windows Phone!
Some important resources:
The Windows Phone Developer Tools Beta includes the following
This Training Kit will give you a jumpstart into the new Windows Phone world by providing you with a step-by-step explanation of the tools to use and some key concepts for programming Windows Phones.
This topic serves as a roadmap into the documentation that you can use to build engaging consumer applications for Windows Phones.
This page lists a set of code samples for developers of applications for Windows Phone. You can download the samples listed here to see how the Windows Phone APIs are used in practice or as a starting place for your own applications. New samples will be added to this page periodically, so check back often and see what’s new.