Just briefly: Trying on my machine at work (no admin rights here whatsoever...)
Apollo 15 liftoff from the Moon.ogg * Firefox 2.0.0.5 does not play at all * Opera 9.2.2 plays using Java, but the time display is broken, and I can't operate the slider (always on maximum) * Same on IE7
YouTube works just fine...
IMHO there is a simple solution. All our videos are free and can be reused, right? So, /another site/ could automatically download all out videos and convert them to Flash/whatever. And we could link to this site, "in case you cat'n see the video". The Java player is on the toolserver already.
Now, the Internet Archive could host that, right? Or Wikia. Or Google or Yahoo. Doesn't really matter, as long as we maintain good relations with them, so they won't drown their pages in ads, and link back to our ogg files.
Cheers, Magnus