Chitika's iPad tracker gained some fame in the days after the iPad launch as it tried to estimate sales based on devices it was seeing appear on its ad network. Unfortunately, the tracker's early calculations proved to be too optimistic, and the number crunchers there have consequently revised their methodology several times over the past few weeks in order to improve the accuracy of their estimates. So while the fact that there may still be a significant amount of error in Chitika's numbers leads us to express caution about believing these numbers completely, it appears that Apple may be at least in the neighborhood of one million iPads sold.
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