The CIA has declassified over a hundred documents in response to an FOI request by the National Security Archive.
Footnotes in the 911 committee report led the National Security Archive to make the requests. The formerly top secret documents show that Bush ignored Bin Laden and al-Qaeda as well as disregarded numerous warnings of an imminent attack. In August 2001 no one could reach him because he was taking the longest vacation of any sitting President since Nixon. I suspect very few people will actually look at these. But the right-wing meme that "no one could have foreseen" the attacks pretty well crumbles when you see evidence of unsuccessful attempts to get W's attention. We knew this already as as result of Richard Clarke's book. Now we have more.