New Zune software–less panicked now.
Although the new Zune software doesn’t start up the moment I plug in my Zune (maybe I’m missing a setting), the Marketplace Apps listing has come back, along with three new games, “Castles and Cannons”, “Dr. Optics Light Lab”, and “WordMonger”:

and one new, very welcome, app, “Windows Live Messenger”:

No update for the Zune HD itself, yet – I was hoping that maybe they’d fixed the web browser issues I was facing with Woot.