I just wanted to quickly mention an extension to support basic wiki-text video sequencing in medaWiki. The extension was built to easily embed metavid content but should be generally applicable to other content sources. Besides sequences, it is similar to the OggHandler extension... For all the details see the blog post: http://metavid.ucsc.edu/blog/2007/09/18/mv_embed-for-mediawiki/
Mv_embed is part of a larger piece of the software (metavidWiki) that is being developed to support basic video editing, and temporal metadata categorization/tagging in mediawiki. If you already caught my presentation at wikimania sorry for the repetition ;)
peace, michael dale metavid.org