Cook Computing

John Robbins points to Tess Fernandez' blog If broken it is, fix it you should. To quote Tess:

This blog is intended to help people that develop applications with the .net framework resolve issues on production system, mainly using Windbg.exe from http://www.microsoft.com/whdc/devtools/debugging/default.mspx along with sos.dll that ships with the debugging tools.

SOS - Son of Strike - is a debugger extension for debugging .NET problems. For an overview of .NET debugging there's the .NET Debugging Facilities(zip) presentation by Brian Long on the DevelopDeveloperDeveloper site.