Late last year at Xiph we worked over our mime types and file extensions for Xiph content. The new set avoids using .ogg for everything and gives the different Xiph audio files a .oga (audio/ogg) and the Xiph video files a .ogv (video/ogg) extension, while using .ogx for more generic multiplexed content in Ogg. It’s important to separate between audio-only and video files – the codecs inside don’t really matter as much to select the appropriate application to start for using the file.
Today I read Fabian’s blog entry – one up for Ubuntu for getting behind it: https://bugs.edge.launchpad.net/ubuntu/+bug/201291 rock!