At some point, everything the governement says, does, or produces should become public record. All classified information, all the President's papers, everything should *eventually* become public knowledge.
When it becomes public would depend on the content. Initially maybe many things are allowed to stay classified. But as that classified information gets older and older, it should be harder and harder for the government to keep it classified.
We are learning much from recent releases of info from the Kennedy administration. But President Bush changed the rules when he entered office. Will all the details of his administration ever be known?
Is there really a national interest in keeping things classified/private 20, 30, 40, 50 years down the line?