Apple announced on its quarterly earnings call this afternoon that iBooks Author had seen 600,000 downloads since its unveiling last week. The folks in Cupertino also mentioned that iTunes U has seen 3 million app downloads, feeling a bump from the announcement a few days ago. One other interesting tidbit: currently, 1.5 million iPads have been deployed in schools. We'd surmise that those numbers will continue to increase as iBooks 2 and iBook Author start to pound the pavement in the months ahead.

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