This is a .Net library for providing custom chrome for WPF windows and some other deeper integration with the Windows Shell. It's a concrete implementation of techniques described here:
http://blogs.msdn.com/b/wpfsdk/archive/2008/09/08/custom-window-chrome-in-wpf.aspx
It's a fork of the original WPF Shell Integration Library, which hasn't been updated in a while, and the download links for that are for older frameworks and the source has some bugs that I've addressed since. Some of this code has since been incorporated into the current .Net framework, but this library gives the ability to use these features in older versions of the framework, or more deeply extend the interop code to enable more features.