.NET Tools: Ten Must-Have Tools Every Developer Should Download Now -- MSDN Magazine, July 2004

Row States and Row Versions
If you are working with ADO.NET DataTables, this is a must read and understand article in MSDN about Row States and Row Versions.

Row States and Row Versions (This is a must read to understand the internal details of a DataTable which is necessary while working with the DataTable).

Manipulating Data in a DataTable This is a good MSDN link to learn in detail about ADO.NET 2.0 DataTable.

Extreme ASP.NET: Codebehind and Compilation in ASP.NET 2.0 -- MSDN Magazine, January 2006 (This is a very good article that clears the compilation model in .Net 2.0). In the final release of windows forms and in the initial release of ASp.NET 2.0 the codebehind partial class and the parsed .aspx class is merged together into one class at runtime and because of some inflexibility (explained in detail in the article) now its modified to a new model in ASp.NET 2.0 so that the partial code behind class is merged with another partial class (that contains all the control declarations) and combined into a single class, the parsed aspx is built into a class that inherits from the previously merged class.

Visual Studio 2005 Web Application Project Tutorials in C#
Scott Guthrie has provided good tutorial in explain this new project type

ADO.NET 2.0 Feature Matrix A semi-detailed explanation of ADO.NET feature set that's mapped to SQL Server 2000/2005

Overview of ADO.NET 2.0 New Features - ExtremeExperts
Quick to the point enhancement list.

ASP.NET.4GuysFromRolla.com: Could you Pass the Salt? Improving the Security in Encrypting Passwords using MD5
Enhacement (by salting before hashing) to Scott Mitchell's MD5 approach.

ASP.NET.4GuysFromRolla.com: Using MD5 to Encrypt Passwords in a Database
This is an excellent article about super securely storing user passwords. MD5 is a one way encryption algorithm.