Eric Woodruff has posted a notice about the future of Sandcastle at
http://sandcastle.codeplex.com/discussions/391591If you have used, are using or intend to use Sandcastle to extract help documentation from C# or VB.NET projects, then you need to have a read of this.
The bottom line is that Microsoft are now in the process of handing over this project to the community. This will mean that fixes to Sandcastle can now go ahead.