A solution has been found to stop WPMU from stripping the html tags from your posts! it’s a quick easy fix even the shorthand coders can edit. This way you can embed flash video files from all your favorite sites without the use of a third party plugin or editing of the single.php pages. However, even if you DON’T want to edit your wpmu installation, I’ve also linked to a wpmu plugin that will allow you to easily add flash video files from your favorite websites without using html.