With the release of Visual Studio 2008 SP1, you can now add smart tags to Excel by using an add-in.  In this video, I show you how to add them to both a document-level customization and an add-in project.

How Do I: Add Smart Tags to Excel Workbooks?

This video is based on the topic: How to: Add Smart Tags to Excel Workbooks, where you can get the code and follow along step-by-step.

Enjoy,
Kathleen