I pick my quality youtube stuff up off reddit. Reddit is essentially a user submitted democratic aggregate site. People submit stuff they find online and it gets voted up or down, the good stuff hits front page, the bad doesn't, there are thousands of "subreddits" that cater to individual topics with their own individual frontpages that are subscribable making it part of your main front page too. The whole system works as a whole.

Reddit's videos subreddit gets some good stuff.

The thing with youtube is it's populated by power users, the youtube partners, they're the folks that have thousands of subscribers. Stuff tends to propagate through them first, people like RWJ(RayWilliamJohnson) advertise videos they find on youtube and make them mega popular, stuff then spreads virally across the internets via places like reddit or through twitter and facebook.

So, basically, you either subscribe to someone in the first place, stumble across them through the popular lists on youtube, or you go to the next level where you stumble across it as a top rated submission on reddit, or get recommended via twitter or fb.

I personally stick with reddit as there's a tonne of crap to sift through and I can let everyone else vote the good stuff up... That and the comments, the reddit community is hilarious to be part of. They were the folks that found and brought to "justice" the crazy lady that threw the cat in the wheely bin not long back for example.

Everything moves lightning fast though and you miss a tonne that goes on just being offline for a day.

EDIT: Just had a look, this fits here quite well, the current top rated video of the day over there