There is an "official" word from the Zune Product Team that we should just wait until tommorrow AND let the battery die.  Then all will be right with our Zune 30GB devices.

Amazingly, they seemed surprised that "a large number of which are still actively being used."  Huh, it is an expensive electronic device, of course we are still using them.

Followup:  It worked.  The two Zunes here are working again.