The company said developers have created more than 11,000 apps specifically for the iPad.
The iPad appears to have ignited a price war among e-reader marketers. Barnes & Noble on Monday introduced a Nook e-reader that is Wi-Fi enabled for $149. Additionally, the bookseller lowered the price of the Nook 3G, which previously sold for $259, to $199.
Amazon quickly responded by lowering the price of its Kindle e-reader to $189. The device had also previously sold for $259.