The Citadel is an archive of information for George R.R. Martin's A Song of Ice and Fire.
New to the series? Read our spoiler-free review of A Game of Thrones.
The book's still not done, but I'm getting awfully close. Another couple of weeks should do it, I hope.
It looks as though it will be the longest volume to date.
The Westeros network consists of several different sites, including a forum and a wiki, for all your A Song of Ice and Fire needs.