[Zope] Serving video out of Zope

It looks like we'll need to serve streaming Dvideo out of Zope in some generally playable format (IE, Mozilla, Opera, etc.) on a variety of platforms (Wintel, MACS (MacOS 8.6, 9, 10), Linux, etc.). The format's somewhat open, but since bandwidth is a consideration and the video streams are significant (an hour to 90 minutes), MPEG is probably not a first choice. It's been suggested that the right control language might be SMIL. Anyone have experience in this arena they'd be willing to share. What works? What are the hidden gotchas?