From that blog entry:

Dailymotion has transcoded over 300,000 videos to the free Ogg Theora format, which will play without the need for plugins in the latest free software web browsers. Dailymotion is among the world’s largest video streaming sites, making this a major advance for Ogg Theora format.

The FSF also has a web page up as part of the Play Ogg! campaign. Ogg formats, Theora for video and Vorbis for audio, are important, because they have no patent restrictions and comparable, if not superior, quality as patented formats. There has been some controversy about the removal of Ogg Theora as the specified format for the HTML 5 <video> tag. 

As of June 29, 2009, the WHATWG summarizes the situation as such:

Apple refuses to implement Ogg Theora in Quicktime by default (as used by Safari), citing lack of hardware support and an uncertain patent landscape.

Google has implemented H.264 and Ogg Theora in Chrome, but cannot provide the H.264 codec license to third-party distributors of Chromium, and have indicated a belief that Ogg Theora’s quality-per-bit is not yet suitable for the volume handled by YouTube.

Opera refuses to implement H.264, citing the obscene cost of the relevant patent licenses.

Mozilla refuses to implement H.264, as they would not be able to obtain a license that covers their downstream distributors.

Microsoft has not commented on their intent to support <video> at all.

The future is uncertain for Ogg Theora – the thing that will determine its success is popular adoption, which some corporate interests seem intent on blocking.