Here is a great article by Arthur Wiegenfeld on why Pluto and all dwarf planets should be considered a subclass of planets.
http://www.theepochtimes.com/n3/1900891-p
Wiegenfeld notes that if there is enough interest, he will publish a follow-up article discussing his ideas for a better approach to classifying solar system objects. If you like this article, please express the desire to see the follow-up in the article's comments section.