I'll have to keep this in mind next time I post a youtube video or some other form of media.
clipped from nick.typepad.com
If nothing else, simply add a <noembed> section which links to the actual video, as this example demonstrates:
<noembed><a href="http://www.youtube.com/watch?v=mkj4Wm6INFY">Click here to view video</a></noembed>]]>
A more user-friendly solution would be to include a <noembed> section that contains a thumbnail image of the video which links to the actual video.