Andrew Sullivan has three interesting posts dealing w/ the concept of just war as it applies to Iraq. They are well worth reading. Find them here, here, and here.
Sullivan's transformation on the war is very significant and interesting. He was a supporter of the invasion. His views have changed, and he has been very open and honest in his blog about those changes.
As his views on the war have transformed, so have his views on the Bush administration because of their conduct of the war, their acceptance of torture, and their willingness to trample upon the Constitution.
His blog is one of the best on the web. Well worth a read.