According to every source I could find every Zune 30 has started freezing. We’ll bring you more as it becomes available.

UPDATE @ 5:50 According to Zunerama all Zune 30s will wakeup tonight. The problem was related to Zune 30s CPU which apparently doesnt like leap years. More later this is ZuneSpring socializing now.
UPDATE After the internal clock moves past December 31, all Zune 30s will begin to work again.