Following the big reveal of the April issue of Vanity Fair having an Annie Leibovitz-photographed feature on Game of Thrones, Vanity Fair has busily been releasing material from the shoots and interviews to whet the appetite. Most notably? This extended interview with George R.R. Martin. Lots of interesting tidbits therein, including his apparent hope that the production slow its tempo a bit by taking time off for a prequel series (as Spartacus did) or a split season (as many, many shows are currently doing these days). Executive producers David Benioff and Dan Weiss also get an extended interview piece, focused on the production side of things.
There have also been some excellent videos released with the cast members from the Leibovitz shoot, featuring everything from advice actors would give to their characters to what other characters they might want to play: