One question I've seen come up frequently is how to convert xyz video format for Zune. If you're technically inclined, a great way to convert a wide variety of video formats is Windows Media Encoder. But Windows Media Encoder isn't as approachable for the non-videophile as Windows Movie Maker, for example.
So if you want to convert, say AVI or Quicktime files for use on your Zune, you can do so using a custom profile and Vista's Windows Movie Maker. Here's how: