I've discovered the next best streaming animation site: Toonami Jetstream. As a fan of Cartoon Network, it pains me to not be able to watch my favorite series daily (blast you, expensive cable!)
But now I can and so can you online. Go to http://www.toonamijetstream.com/app/index.html?applicationType=browser
to watch new and old favorites like Samurai Jack, Megas XLR and (if you must) Naruto.