I miss Zim.
Jhonen Vasquez was treated horribly by Nick, and really deserved better for his amazingness.
I also miss stuff like Ren & Stimpy, Aaah! Real Monsters, Rocko's Modern Life...
Those were the good days of cartoons to be sure. The only one that survived those is Hey Arnold.
Aaah! Real Monsters was the FIRST gothic/humor cartoon on kids TV as far as I know. And you know what? It was awesome.