Re: XiphQT / Theora Questions

I've had fairly good luck with FireFogg.
<http://firefogg.org>
It's a Firefox extension that does video encoding to both Ogg Theora and 
WebM free/open video formats. It should run on any recent version of 
Firefox on any OS. There may be better options for Windows, but since 
I'm exclusively a Linux user myself, I can't comment on any Windows or 
Mac applications.
~Kyle