Also see this:
Mozilla has given the Wikimedia Foundation a $100,000 grant intended to fund development of the Ogg container format and the Theora and Vorbis media codecs. These open media codecs are thought to be unencumbered by software patents, which means that they can be freely implemented and used without having to pay royalties or licensing fees to patent holders. This differentiates Ogg Theora from many other formats that are widely used today.
The Ogg development improvements will be coordinated by the Wikimedia Foundation.
I like OGG Vorbis, but iPods have by far the biggest share of the market and until Apple starts providing Vorbis playback on iPods (and I’m guessing Fraunhofer Institute, who hold the patents for mp3 compression, has something to do with Apple NOT offering Vorbis playback) there is no point in offering Vorbis files.