Eris (Subscribe)
Links
Wikipedia - Eris (Dwarf Planet)
http://en.wikipedia.org/wiki/Eris_(dwarf_planet)
Article describes the discovery and characteristics of the object and its place in the solar system.
The Tenth Planet
An ongoing series of articles in weblog format about the discovery and classification of the object unofficially called Xena.
New Planet
http://www.gps.caltech.edu/~mbrown/planetlila/
Information about the object, its discovery, its place in the solar system and ongoing research, by its discoverer, Michael Brown.