If you're a developer for Windows Phone 7 or interested in development, you'll want to bookmark the Windows Phone 7 Development Best Practices Wiki, which just went live today.
Setup by Justin Angel (see Neurons app) and a bunch of Silverlight developers, its goal is to document and represent the "...current consensus around development best practices for Windows Phone 7. These best practices are collaboratively developed and discussed by the WP7 developers community."
Looks great to us and should be a valuable tool for the community.
Thanks, Justin, for the info!