The answer [1] is Hulu or re-runs on Fox ;) Which actually leads me to wonder why The Simpsons hasn't been toss around to any channel that will take it like Family Guy, American Dad, Cleveland Show, etc. did? I know FX has re-runs now, but man it would be neat to see some Simpsons on Adult Swim.

It's a big IP for Fox and they want to keep inside the family.