Itunes Connect app in the app store from apple
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track sales and info here is the link
http://itunes.apple.com/us/app/itunes-connect-mobile/id376771144?mt=8
http://itunes.apple.com/us/app/itunes-connect-mobile/id376771144?mt=8
Comments
It gives very nice visual charts of your historical info which alone is "worth it".