BAGHDAD, Iraq - The lumbering, low-tech observation balloon, first used on Civil War battlefields, is making a comeback in Iraq (news - web sites). But this time around it's packed with zoom-lens video cameras and thermal imagers. AP Photo The unmanned craft — which look like smaller versions of the Goodyear blimp — monitor battle zones and other danger spots. They're also used to detect possible ambushes on roads used by multinational forces. On a recent evening in Baghdad, three balloons floated over the Green Zone that houses Iraq's interim government, as well as the U.S. and other foreign missions...