Sandcastle now on CodePlex
The Sandcastle project, Microsoft's tools to generate documentation from your well-documented code, is now available on CodePlex. That was already the case, but until about 2 month's ago, that was without the source code. You can now download Sandcastle including the source code from CodePlex.
You can find the related information about this decision here. And you can find the project in Codeplex here.