Apparently, around 2:00 AM today, the Zune models either reset, or were already off. Upon when turning on, the thing loads up and... freezes with a full loading bar (as pictured above). I thought my brother was the only one with it, but then it happened to my Zune. Then I checked out the forums and it seems everyone with a 30GB HDD model has had this happen to them
The issue has been reported on Zune support forums as well.
The issue seems to be related to the latest firmware and some suspect it could have to do with the impending new year change. There is no known cure at this time.