Maybe this is too paranoid, but the article
When the Vice President Does It, That Means It’s Not Illegal (Frank Rich, NYTimes) talks about how VP Cheney was given powers to classify & declassify documents just as the administration was realizing that their urgent justification for the Iraq War was falling apart.
The timing is amazing. Cheney got the power to classify documents just a week before the first hearings of the 9/11 commission (which subpeonaed a half million documents).
And less then four months later, Cheney selectively declassified documents to punish vocal critic Joe Wilson.
From the NYTimes article:
Even now, few have made the connection between this month's Cheney flap and the larger scandal. That larger scandal is to be found in what the vice president did legally under the executive order early on rather than in his more recent rejection of its oversight rules.
But it's still not enough of a smoking gun to get impeachment going.