@Ghost_of_GhostDad: I think FAMILY GUY is just a raunchy, dumber version of THE SIMPSONS and i would hate to see Matt Groening's show turn into that (if it hasn't already). But, like I said, AMERICAN DAD! is pretty good and I just think seeing MacFarlane being on THE SIMPSONS would be cool.
I would very much like to see guest writers as well as guest stars be added to THE SIMPSONS. I don't like Ricky Gervais, but the Judd Apatow episode sounds cool. My only fear is that since the script was never used it might not have been very good, and the only reason they are bringing it back now is because of Apatow's success.