youtube: now offering "watch in high quality"

[krickets]

Hey vidders! Did you notice that youtube is now offering a "watch in high quality" option on select vids? Here are two examples. The high quality link is below the view count. I don't know if this is a beta, which is why it's only available to some vids? Or what? Anyway I thought it was pretty interesting.

Here's a little news about it: Steve Chen said that the high-quality streams will be available in the next months, but only for some of the videos.

I wonder how they're chosen and if it'll eventually expand to all vids? Only three of my 19 uploaded vids have the option. Even the sound is much better.