Author Neil Gaiman (Sandman, Coraline, Stardust) has just announced on his twitter account that he will be guest star as himself on an episode of The Spimpsons titled The Book Job.
Here's what he posted:
About to do something really cool. Up there with writing a DOCTOR WHO level of cool. May post Twitpic clues
He then tweeted a few pictures which you can see above and below, and a couple hours later he tweeted the following:
Went to the Marge Simpson Studios. Recorded my part as "Neil Gaiman", a British author. The accent was the hardest bit to get right.
I've really been enjoying The Simpsons recently. There was a time that I thought the show was really going down hill, but I think that it's found a new fresh life again, and I'm looking forward to seeing what they have planned next.