Looks like Microsoft wasn't able to keep all the cameras away from the Zune HD at the gdgt launch party in San Francisco after all -- we just got tipped this video of a hands-on demo showing the interface and media playback. The OLED screen looks lovely as always, and the UI appears to be fluid and smooth, but we're a little bummed that the multitouch browser doesn't make an appearance. Still, it's definitely intriguing stuff --
