References
MSDN Architecture Center
http://msdn.microsoft.com/en-us/architecture/aa948857.aspx
Books
Enterprise Solution Patterns Using Microsoft .NET (.pdf Download)
Patterns of Enterprise Application Architecture
Microsoft Application Architecture Guide, 2nd Edition
http://social.msdn.microsoft.com/Forums/en-US/architecturegeneral/thread/b9e7208b-3ac8-4207-8545-3b8245705bd4