iTunes 10.1 Beta has also been released today alongside iOS 4.2 Beta 2. Again, this release is currently meant for developers only, running both Windows and Mac. Except for the support of the new wireless printing feature in iOS, there is seems to be nothing new in this release.
Apple has just released iTunes 10.0.1 for both Windows and Mac. This version brings a new sidebar for Ping in iTunes which makes it easier to share your favorite music with friends and family, along with tons of other bug fixes. Full change log is as follows.