Just take a look at the following video posted below, this is truly amazing for a huge website like YouTube to support HD. http://www.youtube.com/watch?v=NoiB1BKvS70&fmt=22 Source: http://www.dashtube1.com/blog/youtube-widescreen-hd-wow
Wow that's a nice one! More videos should be like that But adding &fmt=22 at the end can help a lot already Greetz