Growing up Ones that really stand out:
Ren and Stimpy (BIG time fan when I was little. I had some episodes on VHS)
Teenage Mutant Ninja Turtles
Looney Tunes
Inspector Gadget
Batman Animated series
Superman Animated series
Captain Planet ("The power is yours!"

Garfield and Friends
The Smurfs
Darkwing Duck
Mia the Bee
...and many more I know I'm not remembering right now.
From Blackfire's list
I used to be big on Clarissa Explains it All, Doug, Keenan and Kel, and the original Mighty Morphin Power Rangers.
Shows I watch today
Justice League Unlimited
Family Guy
Still watch
Superman and Batman Animated Series from time to time and Looney Tunes