Robert Green, VSTO MVP, has started a series of tutorials on building on Office 2007! Thanks Robert!
In this first of a series of tutorials on building applications on Office you’ll learn how to create an Outlook 2007 customer appointment management solution using Visual Studio 2008. This step-by-step tutorial also includes full source code in Visual Basic and C#. Check out the tutorial on the VSTO Developer Center:
If you’re just getting started with Office development in Visual Studio, this is a great place to start.