Apple just dropped iTunes 10.1 which comes with the following changelog:
* 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.
Our first tests showed us that iTunes 10.1 its safe for jailbreakers so you can go ahead and install it. Next stop: iOS 4.2