I like a lot of the Adult Swim stuff.
Metalocolypse is great - Deth Clock are awesome.
Frisky Dingo, Sealab 2012. Hmm. Seems like I like older stuff, not sure what is running now.
Also, sing it with me one time. One of the best cartoon theme songs.
Thun-Der, Thun-Der,
Thun-DER, Thun-DEEER,
CATS !