Sparklines are defined by Edward Tufte as intense, simple word sized graphics. Joe Gregario's Sparklines Generator is a web service that will generate these on the fly.
This example, 
, is the preliminary data from the first round of state math testing we recently conducted at Lewis Elementary . Red indicates students not meeting benchmark, green indicates those that met or exceeded the benchmark score. I have found that these simple graphics convey information much better than some of the stuff I have created in Excel.
By way of Jon Udell
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