Recently Chris Ismael, Developer Evangelist from Microsoft Singapore posted a blog post on Innovative Singapore on the resources which Microsoft kindly released to help the developer to learn WPDT 7.1 ( Known as Mango )

This blog post consolidate all the samples and walkthrough on how to use WPDT 7.1 http://innovativesingapore.com/2011/05/a-comprehensive-mango-developer-documentation-reference/