UPDATE - corrected link to wrong briefing.
Froomkin has the best round-up including this quote:
"The report's description of the violence in Iraq, which amounts to an attack on the administration's understanding of the facts on the ground, will likely set the new baseline for how the Iraq conflict is portrayed ....
"The report is replete with damning details about the administration's competence in Iraq. It notes, for instance, that only six people in the 1,000-person U.S. embassy in Baghdad can speak Arabic fluently, and recounts how the military counted 93 acts of violence in one day in July when the group's own examination of the numbers found 1,100 acts of violence. 'Good policy is difficult to make when information is systematically collected in a way that minimizes discrepancy with policy goals,' the report says."