One might responsibly ask: what are they fighting for, that is, the factions in Iraq that continue to resort to violence (guerilla war: terrorism) rather than throw their lots into the nascent Iraqi "formal, mainstream" political process? This question subsumes the "insurgents" as well as the "sectarians," but not the al-Qaeda-affiliated foreign terrorists (to the extent they are still a major factor) nor the regional nation-state actors influencing or controlling their surrogates ("marionettes") in the actual fighting and its attendant politics.
I'm afraid it's a complex and complicated mess, with aims ranging, variously, to a fair share of oil revenues, to a frank desire for "normalcy," to a resurgence of traditional (read "Baathist") lines of authority, to the creation of a strict, straightforward Islamic Republic based on Shia principles, to a regional and worldwide jihad aimed at "heretic" Muslim states and the great West of unconverted. These are just some trends. Underlying much of the energy for war, it seems, is a great Sunni-Shi'ite divide, which I don't understand historically or philosophically or culturally but can compare in virulence, if not scope, to the Protestant-Catholic divide in Northern Ireland. (On that account, as a humorous aside to Prince, maybe President Bush can appoint former Senator Mitchell as special envoy to SAVE the situation, as he did in the popular mind in Ireland.)
There seems to be a lot to talk about. Unfortunately, the "designated forum," the Iraqi legislature and more broadly the Iraqi governmental apparatus, seems to be paralyzed. One question that arises is this: if the government can't fulfill its function, should a substitute be found so that "meaningful" dialog can proceed? Regardless of the adjustments that can rationally, effectively be made internally in Iraq (in the existing government or a parallel or substitute process), it seems like a champion idea to have a regional conference on all matters of concern which bear on the present Iraqi problem. This way would give all stakeholders a voice, ideally, and engage them in constructive action before they are forced to military action by the spreading strife.