When Is a Planet Not a Planet?
Articles discusses the debate whether Pluto should be included among the planets. [Atlantic Monthly]
http://www.theatlantic.com/issues/98feb/pluto.htm

Pluto: Asteroid or Planet?
Looks at possible histories leading to its existence.
http://www.astro.rug.nl/~mwester/aos/aose.html

Pluto: the Accidental Planet
Its status: small planet or large asteroid? Includes facts related to its history. By John Shepler.
http://www.johnshepler.com/articles/pluto.html

Much ado about Pluto
News release from NASA affirming Pluto's planetary status.
http://science.nasa.gov/newhome/headlines/ast17feb99_1.htm

The Status of Pluto
Clarification from the International Astronomical Union on Pluto's planetary status.
http://www.iau.org/IAU/FAQ/PlutoPR.html

Is Pluto a Giant Comet?
Discusses related discoveries and excerpts.
http://cfa-www.harvard.edu/icq/ICQPluto.html