With an easy mod to your Zune software, you can hack the suite so it will recognize all kinds of different video and audio formats. Why would you want to do this? Because even though you can pre-convert, say, DivX to WMV for your Zune, the suite re-converts them again for optimization before syncing.
With this, the Zune suite itself can take in these files and convert them once into a Zune-playable format. This saves you time, plus effort, since it can auto-scan a folder for new files to convert. Head over to Zuneboards to grab the download.
And don't forget, pink Zunes are almost here.
Zune Software Hack: Multi-Extension Support [Zuneboards]