YouTube already made the HD transition, but now it seems that finding content without unacceptable levels of pixelation is a whole lot easier. One eagle-eyed tipster picked up on the apparently new "HD" tab that now sits prominently beside "Most Popular" and "Most Viewed." At present time, there doesn't seem to be a whole lot of interesting (or becoming, to be frank) material on the HD side, but just give it a few months to grow.

[Thanks, Victor]