A new Patterns and Practices book is available for download from the MSDN download center. If you are unfamiliar with the Patterns and Practices publications they contain guidance and solutions for commonly encountered needs or problems. You can find more information about the book here:
http://blogs.msdn.com/microsoft_press/archive/2009/11/22/new-book-microsoft-application-architecture-guide-second-edition.aspx
Tags: Development, Microsoft, .Net