iTunes 8.1.1 is out via software update. The major improvements include better speed and stability while browsing your library, visiting the store, and SYNCING your iPod and iPhone. Another feature that many will be interested in is the ability to rent movies in HD, a feature that was previously Apple TV only. Also those folks with 3rd gen iPod Shuffles can celebrate with iTunes support.
We have received no reports about this iTunes update causing any unusual issues for jailbroken iPhones and iPod Touches -- if you have issues please tell us!
Originally Posted by apple