The Citadel is an archive of information for George R.R. Martin's A Song of Ice and Fire.
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GRRM read the ADWD prologue. He fielded the typical questions: Jon Snow's parent's etc. He could not announce casting news or "HBO would kill him" and since he is sans net here in SD, did not know the news about about Gregor's casting. He has "1400" finished ADWD pages, hasn't begun on the 4th Dunk & Egg short story and had to review all the casting videos for Shae "many times".
The Westeros network consists of several different sites, including a forum and a wiki, for all your A Song of Ice and Fire needs.