For evidence of how quickly the tide of war can turn, look no further than Osama bin Laden's latest epistle to his al Qaeda underlings in Iraq. The theme of the audiotape, broadcast on al-Jazeera TV last week, is purportedly the need to avoid "division" in the prosecution of jihad. The not-so-subtle message: You guys are screwing up - big time. From his bloody-handed perspective, he's right to be worried. Both American and civilian casualties in Iraq are on track to drop drastically for the second straight month - a direct result of the sharp rise in Iraqi cooperation with...