Microsoft announces NuPack, a new package manager for open source .NET libraries
nupack.codeplex.com
nupack.codeplex.com
I tried to get started building something similar a couple of years ago, but the VS extension API kinda defeated me.
I was all enthused when John Lam did a demo of scripting Visual Studio with IronRuby (I don't think it was his work, he was just demoing it), so I sent him an email asking after the source, but it turned out not to be something they were going to release. Which was a shame. He did make it look awfully slick.
VS2010 has a new, WPF-based shell/editor. That brings along many new .NET-based integration points and mostly obsoletes the old editor APIs. They've also improved the plugin-loading architecture and several other things. However, do do any meaningful integration, you still need to code to the poorly documented COM APIs. The project system, for example, hasn't changed much at all since VS 6.
If you're interested in this space, you'd do well to check out @serialseb's OpenWrap: http://serialseb.blogspot.com/2010/07/intro-to-what-openwrap...
It's still in active development but, from demos I've seen if it, it looks very good. It seems to cover far more use cases than NuPack and has an elegant design.
Isn't that what .NET is all about?