Here's a cool article from GRRM about the show and the latest book:
http://nymag.com/daily/entertainment...is_favori.html
He plays it pretty close to the vest, but it's good to know that he'll be back working on book 6 in just a few months.
Not sure if anyone posted this, but tower of the hand is a great resource while reading each of the books, and reviewing past events:
http://www.towerofthehand.com/books/guide.html