I have published a MediaWiki extension called "LinkSwf".
It creates a link to play Flash Video files (SWF).
It has the following features:
* Plays the video on a maximized window.
* Works on Internet Explorer and Firefox.
* Can stretch the video to fill the window or play it in a predefined size.
* Supports detection and update of the Flash Video player.
* Can be used inside a template.
http://www.mediawiki.org/wiki/Extension:LinkSwf