PEX, TDD
http://research.microsoft.com/pex/
http://research.microsoft.com/pex/screencast.aspx
http://csdl2.computer.org/persagen/DLAbsToc.jsp?resourcePath=/dl/proceedings/&toc=comp/proceedings/ase/2006/2579/00/2579toc.xml&DOI=10.1109/ASE.2006.51
http://channel9.msdn.com/posts/briankel/Pex-Automated-Exploratory-Testing-for-NET/
http://research.microsoft.com/pex/wiki/Reference%20Manual.html
http://research.microsoft.com/pex/articles/pextutorial.pdf
http://research.microsoft.com/pex/downloads.aspx
Silverlight, Surface
http://silverlight.interknowlogy.com/Videos/VitruView/default.html
Design Patterns
http://en.wikipedia.org/wiki/Null_Object_pattern
http://www.codeproject.com/KB/architecture/DotNetMVPFramework_Part1.aspx
SQL Optimization
http://wiki.lessthandot.com/index.php/SQL_Server_Programming_Hacks_-_100%2B_List#Query_Optimization
My (almost) Daily Links 