The official Microsoft Excel Team blog points to some great video looks at Sparklines coming in Excel 2010. These could be a great combination to the Excel report functionality found in GP 10 and enhanced in GP 2010.
More Excel 2010 Posts
Excel & OfficeGP 2010GP 10
Archived post from 2010. Dynamics GP and the links it points to have changed since; check current documentation before relying on version-specific steps.