The Citadel is an archive of information for George R.R. Martin's A Song of Ice and Fire.
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Someone ahead of me in line asked about the reissue of the Wild Cards books, and GRRM replied that they were going to be reissuing the first eight, hopefully to be followed by two new volumes. And that, if they can find Brian Bolland , they'll be using the Bolland artwork that was on the UK editions!! [you can see three of them on GRRM's SFWA bibliography page]. And if you don't know Bolland's work, I'd highly recommend seeing if you can dig up the trade paperback of Camelot 3000.
The Westeros network consists of several different sites, including a forum and a wiki, for all your A Song of Ice and Fire needs.