Note: Apple just released a new Safari Version 5.0 (6533.16) for OSX Leopard and it plays ALL the videos I've converted with the "microconverter" software I referred to above. The previous version didn't work with HTML5 videos.
FireFox 3.6.3 on OSX Leopard plays the demo video used for this mod, but NONE of the converted videos.
IE8 under Windows XP just sits there and says "loading" with ALL the videos ...
I think HTML5 is the future for videos under vBulletin 4 (we're testing this under v4.03), but obviously all browser platforms under all operating systems need to support the standard properly.
Just my opinion ...
Regards,
Badger