Blood of Dragons is the only author-approved MUSH based on George R.R. Martin's A Song of Ice and Fire. Play the Game of Thrones and become a part of the history of the Seven Kingdoms:
The game—as well as the whole Westeros.org site—is run by Elio M. García and Linda Antonsson. On the MUSH we are Balerion and Nymeria. On the A Song of Ice and Fire forum we are Ran and Linda.
We became involved with George R.R. Martin when we contacted him to ask his permission to create the MUSH. He very graciously not only gave us permission but provided us with various bits of (as of yet) unpublished information, such as additional houses and some information about the time period the game takes place in. We are now collaborating with him on the forthcoming setting guide, The World of Ice and Fire.
The Westeros network consists of several different sites, including a forum and a wiki, for all your A Song of Ice and Fire needs.