Here. If you haven't seen it yet, you should check out Magic: The User Interface Library for .NET. It's got a ton of the UI stuff you always want, e.g. docking windows, menus with graphics, control styles and tons more. And the price is right -- it's free!
BTW, there is some overlap in the UI department with Genghis [1], but Genghis has some other non-UI stuff worth checking out, too.
[1] http://www.genghisgroup.com
Here. "Of course, there is the question of whether this book will actually improve your .NET development skills, but in riposte, you can honestly say that no volume details the CLR and its potential so well, and that this alone is worth the book's cover price."
Here. With the support for scripting built into .NET [1], I'm surprised it took this long for someone to rebuild the COM-based Active Scripting for .NET (although I wish it'd been us and that it was free : ).
[1] http://msdn.microsoft.com/msdnmag/issues/02/08/VisualStudioforApplications/default.asp