The Citadel is an archive of information for George R.R. Martin's A Song of Ice and Fire.
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When I saw George yesterday at the Colchester signing, he said that the third Dunk and Egg story is nearly finished. He didn't say how/when it is going to be published though...
The Westeros network consists of several different sites, including a forum and a wiki, for all your A Song of Ice and Fire needs.