The final version of iTunes 10.1 for both Windows and Mac has just been released. This version of iTunes will be required to install iOS 4.2 (when released) on iPhone, iPad and iPod touch.
Full change log of iTunes 10.1 is as follows:
What’s new in iTunes 10.1
• Use AirPlay to instantly and wirelessly stream videos from iTunes to the all-new Apple TV.
• Sync with your iPhone, iPad, or iPod touch with iOS 4.2.
• Provides a number of important stability and performance improvements.
Download iTunes 10.1 for Windows and Mac