Apple released a new iTunes upgrade version which dedicate especially for iPad users. The iTunes 10.5.3 allows iPad users to sync interative iBooks textbook to your iPad.

iBooks textbooks are created with iBooks Author which are now available as a free download on the Mac App Store.
This update is important for iPad users who are occasionally use iTunes to backup their data instead of iCloud. Some users might prefer the old way to store their backup and are not comfortable with the iCloud syncing platform.
The update is available for both Mac and Windows users.