A fanlisting is a place for all fans of a particular show, movie, actor/actress, singer, etc. to come together and build the biggest listing of people from all around the world who are fans of that subject.
(from TheFanlistings.org)

This particular fanlisting is for fans of the song Vestige by T.M. Revolution, also an insert song from the anime series Gundam SEED Destiny. If you're one of them, feel free to join!