At the DevCon I became really excited about the VSTO 2005. I Found this download at microsoft.com about Using Dynamic Controls and Views with VSTO 2005:
“This sample solution teaches how to use dynamic Microsoft .NET managed controls and dynamic views in an Excel 2003 solution using Microsoft Visual Studio Tools for the Microsoft Office System, Version 2005 Beta 1. The solution is written in Microsoft Visual Basic .NET“
http://www.microsoft.com/downloads/details.aspx?FamilyID=5AC2AB6A-08B9-4476-9772-E9A471800DB8&displaylang=en%20%20%20%20