http://whatculture.com/tv/10-best-ever-guest-stars-in-the-simpsons.php

Which actors and actresses were most successfully Simpsonized?

could you post the list?

The list is ok. I didnt like the Johnny Cash guest spot because I thought the whole hallucination or whatever took way too long. Get back to the episode. But the person is spot on. Micheal Jackson's guest spot, I think, is way better than Liz Taylor because Liz Taylor only said one word and she would later be on another episode of The Simpsons when Krusty was planning a comeback special.

The one with Michael Jackson is a classic.

http://whatculture.com/tv/the-simpsons-10-worst-guest-stars-ever.php

Being on the Simpsons is a sign that you've made it - but it doesn't always work out.

How about Jane Fonda who was on this past Sunday?