In response to 371, you are correct in many aspects. Where I think you're missing the point is the heart of the Arab world is not being faught. It's quite different. And now it's more a civil confrontation than anything else. Where the region has a homogenous population (mostly Kurd or Shite) the area is largely, but always peaceful. It's where there is a blend of Sunni's Shites and Kurds (although less Kurdish involvement) is where the problems are. It's Sectarian. Not the fight you're portraying.
AL Qaeda, Iran and Syria has planned the sectarian violence so they can drive the US out of Iraq and declare their divine victory, control Iraq and the Middle East, and use its oil resources to destroy us and the West. If you read Zaraqawi letters before he was killed you know exactly that the whole Al Qaeda plan from the begining was to create such a secterian war so the American people will lose "hear to fight" and surrender Iraq and the Middle East to the terrorists. If we leave Iraq because we think it is just a civil war between Sunnis and Shia then we have fallen into the trap of AL Qaeda and Iran.