MSDN WP7 Beginner Training
WP7 Development for Absolute Beginners in 64 parts on channel9
Windows Phone Developer Quickstarts on the AppHub
WP7 Offline Training Course
WP7Comp - Red Gate Software competition site seeking submissions for WP7 apps that developers will love (competition now finished). List of Entries.
WP7 Developers Blog
Credit card Processing on WP7
Shawn Wildermuth’s Phoney application now available on codeplex
Jeremy Likeness - UltraLight.mvvm
Laurent Bugnion – MVVMLight (lot’s of information)
Samuel Jack’s Simon Squared game - source opened
Interview with Ash Morgan who’s developed quite a few WP7 apps
Coding4Fun has a few WP7 articles
Microsoft Platform Ready