Lists like this one, of different famous actors and which simpsons character they could play, seem to come along every so often.  (I linked to one a while back that was apparently taken from here.  The one I originally linked to didn’t have the names, the original one does.)  Of this list I’m particularly fond of Jodie Foster as Ms. Hoover, Joe Pantoliano as the sarcastic guy, and Jon Hamm (great picture of him with a five o’clock shadow) as Lenny.