Apple has released iTunes 10.5.3, with adding the ability to sync interactive iBooks textbooks to users' iPads. These multi-touch textbooks are available for purchase from iTunes Store. iBooks 2 is also available free on iTunes App Store.
New to iTunes 10.5.3 are:
iTunes 10.5.3 allows you to sync interactive iBooks textbooks to your iPad. These Multi-Touch textbooks are available for purchase from the iTunes Store on your Mac or from the iBookstore included with iBooks 2 on your iPad.
iBooks textbooks are created with iBooks Author — now available as a free download on the Mac App Store.
For information on the security content of this update, please visit: support.apple.com/kb/HT1222
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