A firmware update will bring two great features to the Zune HD this spring. The first is native XviD support, which is self-explanatory. The second requires just a tad more explanation.
The Smart DJ feature, now on the Zune's PC software, will make its way to the HD, offering on the fly track suggestions. That's OK—pretty similar to the iPod's Genius features—but what will make the feature great is that Smart DJ will also work over the Zune HD's Wi-Fi connection, allowing you to stream these suggested tracks from the cloud (instead of needing to have all that suggested music stored on the device already).