Pluto is no longer a planet.
Many scientists and pundits have weighed in on this debate. So far my favorite ponderings are from columnist David Grimes:
Pluto has always been my favorite planet because it was named after Donald Duck's dog. (If you disagree with this, please send your letters to: P.O. Box 1234, Uninterested, Calif.) Granted, Pluto was a rather minor character in the Disney universe, but let's face it: When you're the ninth planet from the sun, do you really deserve to be called Mickey?