Perhaps you've been reading about the National Intelligence Estimate from April 2006 that claims that the war in Iraq has made matters worse for the United States in its war on terror. If you haven't heard about it yet, I recommend this round-up of articles by Tom Regan of The Christian Science Monitor as well as this daily analysis by Eben Kaplan of the Council on Foreign Relations.
When the story broke, the NIE was still classified. The key judgments of the report are now declassified. If you go to this page on the CFR website, you'll see a link to a PDF (66 KB).