In this episode of MSDN TV, Craig Skibo uses the Visual Studio .NET 2003 automation model to build a tool window hosted within Visual Studio that allows you to read blog postings. Even if you’re not interested in reading blogs within VS.NET, this is a good foundation for building any kind of managed tool window. Runs for about 10 minutes.
While I'm at it, I'll plug Craig's book called Inside Microsoft Visual Studio .NET 2003. It covers the Visual Studio .NET 2003 add-in architecture, the automation model, wizards, macros, and much more. If you'd like to extend the capabilities of the IDE or automate a lot of your repetitive tasks, this is the best book I've seen.