Great find, Joe!
I clicked some at random (Bugs Bunny, Mickey, Futurama, Tex Avery) and they've already been removed...
Plenty others are still live and kickin'

Wow. Thank god am not 10 anymore. Because otherwise my life would be over.

Not just cartoons:

http://www.youtube.com/profile_play_list?user=DiggUser
http://www.youtube.com/profile_play_list?user=DiggUser2

I am not sure how updated these are since these are a few months old when I saw the posts on Digg.

Not on YouTube (ALL seasons and episodes):
http://www.allsimps.com/ -- The Simpsons
http://allfutus.com/ -- Futurama
http://allaboutsp.com/ -- SouthPark

Who knows how long those three will last.