We are pleased to announce the release of TinyGraphs, an open source
Excel add-in for generating sparklines.

The sparklines, or tiny graphs, are as small as a cell and can be
placed next to the items they describe. Multiple number of such
graphics present an elegant way for visualizing large quantities of
data, such as stock prices and exchange rates.

The TinyGraphs plug-in creates a sparkline for every row of data in a
rectangular block of cells. It supports lines, area and column charts
and provides options for customizing them. The tiny graphics generated
by the plug-in can be further reformatted for more variations, like
soft shadows, 3D and glow effects.

TinyGraphs currently supports Excel 2000, 2003 and 2007.

More Information
http://www.spreadsheetml.com/products.html