"Microsoft .NET Development for Microsoft Office" by Andrew Whitechapel
If you are doing any type of Office development with .NET, you need to invest $33.99 for Andrew Whitechapel's book Microsoft .NET Development for Microsoft Office. Andrew knows all the little (and big and dirty) secrets of hooking Office with VS that most people never would find out on their own. It's a relatively small and definetly worthy investment to learn from one of the greatest office developers in the world.
You can preorder it on Amazon now....