From the product description:
An age-old prophecy foretold the coming of the Blackest Night, and the war of light between the emotional spectrum! The Green Lantern and (yellow) Sinestro Corps are confronted by the Red Lanterns, Agent Orange, the Blue Lanterns, the mysterious Indigo Lanterns, the (violet) Star Sapphires and, ultimately, the Black Lantern Corps. Now, for the first time ever, all of these Power Rings are collected together in one spectacular display!
Apparently, The Blackest Night is an upcoming crossover event from DC comics that “follows Green Lantern: Rebirth and Sinestro Corps War as the third part of a trilogy throughout the Green Lantern comics.” It is scheduled to be released in June of 2009. If you are excited enough about this to drop $230 on metal rings in a light up display base, more power to you.
Product Page ($230 / October 2009 pre-order)