Hot on the heels of yesterday's Zune Firmware update, here's the Zune Software update. The update fixes some bugs in the installation process and also adds Vista support.
We haven't seen any problems with the Zune installer or yesterday's Zune firmware update, but a few unlucky folk have. We're not sure what these people do to their machines—we're using a standard Windows XP MCE box with a bunch of apps on it—but whatever it is, they should stop.
Either hit the download page or use the Zune's self-update to get the new version.