BeetTV says so:
Beet.TV has learned that You Tube will introduce new functionality to its platform tonight which will allow users to organize clips around specific categories.
Up to now, clips saved to an account or uploaded to dedicated channel are organized in what often seems a random process — usually arranged chronologically, but not always.
The new interface will allow users to organize clips according to designated categories.
I can’t imagine that such a feature was anything but “long time coming….”
Related: Gary has a list of YouTube like mobile apps…