_iTunes is a free application for Mac and PC. It plays and manage all your digital music and video. It syncs content to your iPod, iPad, iPhone, and Apple TV. And it's an entertainment superstore that stays open 24/7.

About iTunes 10.5.3:
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

Download: iTunes 10.5.3 x86 | 64-bit (Windows) | macOS

_

With iOS 5 and OS X 10.7.2 in the corner, Apple has officially turn on it's iCloud services for all users.
Get your copy today from: http://support.apple.com/downloads/DL1459/en_US/MacOSXUpdCombo10.7.2.dmg