The Citadel is an archive of information for George R.R. Martin's A Song of Ice and Fire.
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My first stop was the George R. R. Martin session. He began things by stating the rules: no asking who dies, what happens at the end, and when the next book is coming out. He announced that they're re-releasing his book The Armageddon Rag (the book that "nearly ended" his career and sent him to exile in Hollywood). He also announced that Tor will be releasing three new Wildcards books. And, of course, he announced (for anyone who didn't already know it) the deal with HBO to do a set of Song of Ice and Fire miniseries. The one difference in this announcement is that while the original stories that came out indicated that the miniseries would be produced for sometime next decade to coincide with the ending of the heptology, Martin today indicated that the producers were working on a pilot episode now with the intent that HBO would pick it up and start on season one next year. He is very, very happy about the HBO deal, btw, gushing over the quality of television that HBO is producing and saying this was really the only good choice for getting Song produced in the visual media.
Some other bits of info from Q&A: In Song, he considers Bran the hardest viewpoint character to write, while Tyrion is the easiest. The Red Wedding was partly based on a historical event in Scotland called the Black Dinner. His biggest lament in splitting A Feast for Crows from A Dance with Dragons is the parallels he was drawing between Circe and Daenerys. He credits the creative success on Wildcards to the system that they put in place, making all authors sign an agreement at the outset and establishing a point system that gave creators extra distribution of profits for use of their characters in the works of other authors (thus encouraging them to let others play with their creations, making the shared universe cohesive).
The Westeros network consists of several different sites, including a forum and a wiki, for all your A Song of Ice and Fire needs.