Top 25 Simpsons Guest Appearances

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From IGN.com:

As The Simpsons heads into its 18th season this Sunday, all this week at IGN TV we’re taking a look back at the best elements of the animated series. Today we present what we think are the 25 best guest appearances. Also this week we’ll run down the 25 best peripheral characters on the show, along with the best episode from each of the past 17 seasons.