Since there's an american comics thread (which is dead), why not make one for cartoons? I love cartoons (I don't have much of a life >_< ), usually because they can get away with things that can kill you in real life.
Here's some of my favorites:
Super Mario World (I remember waking up at 6 in the morning just to see it when I was little)
The Grim Adventures of Billy and Mandy
Family Guy
Futurama
Ed, Edd, n' Eddy
Batman Beyond (it's what actually got me into Batman)
South Park
Justice League Unlimited
Reboot