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.
Yes, A CLASH OF KINGS sold considerably better than A GAME OF THRONES. These series have a tendency to build.
It was a NY TIMES bestseller, which GAME was not. Also made lots of other lists.
However, in the publishing biz it is considered impolite to ask a writer about his sales figures... like asking someone how much they make when you meet 'em.
The Westeros network consists of several different sites, including a forum and a wiki, for all your A Song of Ice and Fire needs.