Irwin R. Schyster said:Jem
Thundercats
C.O.P.S. (the cartoon, look it up, with Bulletproof)
Transformers (G1)
GI Joe
Sailor Moon
Darkwing Duck
Ghostbusters
Batman: The Animated Series
Teenage Mutant Ninja Turtles (original)
X-Men: The Animated Series
Tale Spin
She-Ra
Tiny Toon Adventures
Beetlejuice
Mummies Alive
He-Man and the Masters of the Universe
Gargoyles
Cybersix
Superman
Samurai Pizza Cats
Alvin and the Chipmunks
Some great ones in there (and plenty I've never even watched/heard of). My favorite from that list is easily Batman: The Animated Series, and second place for me would either be Tiny Toons or Sailor Moon.
Never heard of Samurai Pizza Cats, but I love Samurai (well, swordsmen), love Pizza, and love Cats so it sounds like something I'd love. Plus, from what little research I've done, it's anime, which is a major plus. I'll definitely be checking this out in the future (no idea when though, I've got roughly two hundred shows to watch).