Apple has released iTunes 10.5.3 with some additional features like support for textbook syncing to the iPad as just yesterday company introduced iBooks 2 and textbooks to the iBookstore on its Education Event.
See also:
iBooks 2 for iPhone, iPod Touch and iPad Available Now
iTunes 10.5.3 Updates:
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.
You can grab the latest iTunes via Software update or through direct download links below.
Download iTunes 10.5.3 for Mac & Windows