There is a new book about VSX out from Wrox called “Professional Visual Studio Extensibility” and looks pretty promising if you are first starting out to learn add-ins and VSPackages.  It's actually the first one that I've seen get released so I hope it does well.  VSX is a topic that I have a keen interest in.

• A quick overview of Visual Studio Shell and Domain-Specific Languages Tools
• Techniques for creating, debugging, testing, and deploying your add-ins
• Ways to work with user interface elements, Windows Forms, and controls via code in your add-ins
• Steps for extending Visual Studio functionality using VSPackages
• Tips for writing and managing code snippets to make your coding process easier
• Using Visual Studio templates to save time when writing code for common projects
• How to use MSBuild to write custom builds for Visual Studio and .NET applications
• New techniques for recording, developing, debugging, deploying, and running macros

Ed B.