What do the Iraqi insurgents want?

Found myself asking this question today, perhaps thinking about the passions that could have led to the taunting of Saddam Hussein as he was about to be hanged...I realised I didn't know, and should try to know...It might be worth finding out what they are fighting so passionately for (or against). Found this Washington Post Article by Hiwa Osman (written in 2005, but still v. helpful).

Hiwa says in particular, the following:

there's more than one [strategy]. That's because the insurgents are actually several groups of people who might share tactics, but possess different motivations and long-term objectives. Thus the appeal on the side of the generator in transit might have had an effect with one group of the insurgency: those who were fired from their jobs in the military and other government institutions for being members of the Baath party but who don't really believe in Saddam Hussein's doddering old brand of Arab socialism. But two other important factions of the insurgency -- the die-hard Baathists and the pro-al Qaeda Islamist militants -- would not hesitate to attack what they would see as a perfect target: a giant generator, 12 policemen and 16 Iraqi national guardsmen. Promoting instability by disrupting public services and crippling the security apparatus of the new Iraq is the heart of their strategy.