We were working on a dashboard for one of our customer and had investigated the use of http://www.wordle.net/ to generate word clouds for use in a dashboard. The site take a document and gives greater prominence to words that appear more often. In this sample we have used the last 4475 comment threads on our support forum to generate the above picture.
For a sales graphic it could be used to highlight the leading products or the most active customer or salesperson. For more information on dashboards you might be interested in attending our free workshops in the coming months http://e-ms.ie/excel-dashboard-workshop/