Other link blogs
Matt - 16 Links Today (2007-09-21)
Arjan Zuidhof - LINKBLOG for September 21, 2007

Web stuff
Steven Smith - AJAX Control Toolkit Update September 2007
Bertrand Le Roy - OpenAjax InteropFest 1.0: Microsoft's entry

Other stuff
Greg - Another OwnerDraw Example - This Time Adding Red Squiggles to Text in a TextBox
Ray Gilbert - CodeDom Assistant
Tim Stall - Free Development Tools
Microsoft Downloads - GPMC Sample Scripts
The Moth - How to go from Thread to ProcessThread and Write your own GC Heap Viewer for NETCF
Julie Lerman - QuickStart for building an Astoria data service
Saar Yahalom - Tcp Session Reconstruction Tool

Testing stuff
Brad Wilson - Answering xUnit.net Questions
Roy Osherove - Code-Reuse in unit tests is more important than you think and XUnit.NET aims to be the Next NUnit, but it's too soon
Phil Haack - Test Secure Class Instantiation Helper Method and Unit Testing Security Example
Bil Simser - The World Doesn't Need Yet Another .NET Testing Framework

Database stuff
Aaron Bertrand - Elaborations on my SQL Server 2008 slides
Idreeskhan - Find Primary Key or ID column of Table in SQL Server 2000/2005

Debugging stuff
Scott Hanselman - Multi-threaded Debugging in Visual Studio 2008