1) Good article on XHTML formatting and generation using ASP.NET ! Watch this space for more on XHTML generation.
2) Sitepoint has a good bunch of articles on Website designing too ..
3) Expert Tips for Finding Security Defects in Your Code - Rob Howard
4) MSDN TV: What is WinFX -The New Programming Interface Introduced in Windows "Longhorn". Learn the object-oriented, managed API for the breadth of Windows "Longhorn" and how it relates to the work you are already doing on the .NET Framework.
5) FoodMovers : Building Distributed Applications using Visual Studio .NET - This is a series of articles on design, create, deploy, and maintain enterprise-class distributed applications.
6) An Introduction to C# Generics - Juval Lowy - I don't know how i missed this one !
7) Source : Clemens Vasters : Joe Long, the Product Unit Manager for XML Enterprise Services at Microsoft, talks about the Indigo migration story in this recorded presentation on MSDN. If you weren't at Joe's PDC talk and think you don't have 37 minutes time for this, you can still not afford to miss listening to the prescriptive guidance section starting at slide 60, if you ever have or will cross an application domain boundary with a Remoting, Enterprise Services or Web service call on the current stacks. And now leave here and go there.