Michael "Faster, Please" Ledeen has a great column in National Review Onliine. He stresses the importance of recognizing that the Iraq conflict is regional, not merely confined to the boundaries of Iraq.
We cannot "solve" Iraq's problems by acting solely within the confines of the nation, because at least three other terror masters of some significance — Iran, Syria, and Saudi Arabia — are fighting for their survival in Iraq. Against us. Moqtada is an Iranian creature, and Iran has long since created a huge network inside Iraq, ready to respond to orders from Tehran.
BTW, Ledeen cites Belmont Club and the Iraqi blogs. Read the whole thing.