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 Winds of Winter is as yet unscheduled, as it has not been completed. However, in a recent interview Martin hoped (we must emphasize, hoped; he makes no promises) that the book would be done in 3 to 3.5 years.
The Westeros network consists of several different sites, including a forum and a wiki, for all your A Song of Ice and Fire needs.