This afternoon I've spent some time with the Visual Studio SDK. After going through some of the docs and examples I whipped together some basic integration of IronRuby with Visual Studio 2005. It currently includes support for syntax highlighting, reformatting options and debugger support. All of this was surprisingly easy to implement - much more so than the last time I played with it. I'll definitely spend some more time with the VS SDK in the near future to integrate with other parts of Visual Studio, such as the project and build systems.