These are more adult cartoons that probably won't be found on those networks but I enjoy them:
The Ricky Gervais Show (animated series made from podcasts featuring the always hilarious Karl Pilkington).
The Boondocks
The Life and Times of Tim
Scooby Doo - Mystery Incorporated started out brilliantly but is now in the same league or possibly worse than What's New Scooby-Doo.