UPDATE

I have posted an update to the file "GH-Excel_v0-02" which adds a bit of new functionality and fixes a few errors.

http://neoarchaic.net/2011/01/gh-excel-suite/

The new update to the GH-Excel Suite includes

-correction to the "area" chart type which was conflicting with the color/ fill inputs foro data points.

- addition of new graph component Excel Chart (update) which allows for the active updating of an already created chart.  It uses the "Title" input to name the chart, then checks the active worksheet of excel to see a chart with this name exists.  If so, then it updates this existing chart rather than producing a new chart every time.  If there is no chart with than name, it will create a new one.  The old chart type is still there, in the event you simply want to make multiple charts. The component outputs a string (A) which tells you where the component has updated or created a new chart.  Additionally, it is recommended that you not use a "stream to excel" function with formatting when actively updating a chart, as this will drastically reduce the refresh rate of your chart.  I have found using the basic stream data with a fully formatted has made updating almost instant.

PLEASE post a comment if you find any bugs, I am continuing to try all combinations to check for conflicts.