Here's what I've been watching lately on Netflix:
Danger Mouse, Jem and The Holograms, He-Man / She-Ra ( http://retro-daze.org/site/article/id/100 ), Real Ghostbusters
And for more of my taste, here's more stuff I liked when it was on:
Eek! The Cat, Bobby's World, Powerpuff Girls, TMNT 2nd series, TMNT Fast Forward, Batman The Animated Series, Batman Beyond,Tiny Toons, Space Ghost C2C.
I'm open to modern stuff, too. For instance, I really like Regular Show and the Viva Pinata cartoon. But I do have to say, no post-80s anime. Like, Speed Racer's cool, so is the Akira movie and so forth - but the category has a low signal/noise ratio for me, and Netflix has too much of it.