Loved Dexter's Laboratory. I missed most of Samurai Jack, but what I did see was good. Adult Swim is currently showing Sym-Bionic Titan on Saturdays at 2am (so that would technically be Sunday at 2am). It's pretty good too.
Did they make more than one season of Sym-Bionic Titan? I thought the art was gorgeous, but it felt like a decent high school drama, an awesome "large mecha fighting monsters" drama, but that the two halves didn't blend well at all. The strongest episodes were the ones that were either entirely in the high school, or entirely in the suit.
I also enjoyed the political stuff & (oddly) the robot dating the cheerleader.