There is a ton of new (and older) content up at Winter-is-coming.net for HBO's Game of Thrones leading up to the April 17th premiere. Going from oldest to newest:
Artisans: The weapons of Westeros:
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Inside a Game of Thrones airs on HBO:
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The Artisans: Armor Design:
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The Artisans: Bruises with Buster (inside the creation of fight scenes)
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Iron Thrones Teaser:
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The Artisans: Actor Maisie on playing Arya:
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Behind the Scenes: Invitation to Westeros:
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Extended Iron Throne teaser:
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First Full Trailer:
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Four new HBO posters:
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House Stark Featurette and 2nd full trailer Fear and Blood:
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House, Baratheon, Lannister, Targaryen videos, as well as video character portraits for many of the main characters from the first book:
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HBO's Maester's Path challenge which unlocks additional video previews:
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Lots of awesomeness here. Getting closer and closer to the premier and HBO is really ramping things up.
www.winter-is-coming.net has excellent daily coverage on the HBO series for those interested.