Considering that iBooks is good for iOS4 enabled devices, and that iTunes just had an update to 9.2.1, it seems obvious to update iBooks to 1.1.2.

According to the official word at iTunes, version 1.1.2 has several improvements, such as double-tapping an image within a book to view in more detail, substantial performance improvements when reading PDF files, and experiencing books with video and audio.

The price is still free.

Source

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