IIRC, the iPhone version is H.264, but at a lower bitrate, so they have 3-4 h.264 files per video:<p><pre><code>  * 720p version for hdtv videos
  * 480p version for non hd web viewing
  * High bitrate version for iPhone streaming on wifi 
  * Low bitrate version for iPhone streaming on 3g or edge.</code></pre>