I couldn't get Extreme Video to work so I hacked the Anarchy plugin instead and have kmil flashembed working on my mu test blog. I couldn't get editor buttons to work via buttonsnap for gui controls, probably cos Mu tinymce is way ahead of WP, so embeds are in the format [kml_flashembed movie="http://PATH TO SWF OR GOOGLE/YOUTUBE ADDRESS" height="xx" width="xx"/]
.
This will embed any swf including YouTube, Google Video and iFilms.
Simple links to mov, mp4 and 3gp will play in QT, as well as flv and wmv.
Anyone interested in beta testing it to see how many installs it breaks? Download is here and install is now just unpacking the files in mu-plugins, no edits necessary.