Higher quality YouTube videos

Wondered if anyone had heard about the higher-quality YouTube videos. Apparently a lot of the newer videos are being encoded with H.264 in addition to the standard encoding. You can view the H.264 version of a video by adding &fmt=6 to the end of the URL, ie:
http://www.youtube.com/watch?v=e0PdrJOjfOs&fmt=6

Try comparing the H.264 version and the "standard" version of a video, the H.264 really does look better.

Apparently the iPhone can't play Flash very well, but has a built-in hardware decoder for H.264, so the only YouTube videos the iPhone will play are the H.264 encoded ones.

Wow!! It does work. That is great, thanks for the info, but it don't work on my vids