CSM has a bit on a Strategic Studies Institute report on the continuing occupation of Iraq. The authors doubt that the U.S. will be able to put down the insugency before leaving, or train Iraqi security forces sufficiently to do the job themselves. Moreover, they suggest that the U.S. start to consider that an undemocratic government may be necessary to create a stable Iraq. Additionally they argue that a timetable for withdrawal would not be helpful.
There is also a link to an NPR interview with a former director of the NSA, who argues that the best thing we can do for democracy in Iraq is leave now.