Saddam is not a sick man whose psyche need to be studied, nor is he one of those great wrongdoers that will be forever remembered. He is no Hitler and he is no Vlad the Impaler. There is not much to be studied in him. He is only a man affected by power. He is not a good "people like him" example. I am not saying he was a good ruler, but he certainly wasn't mad. If the purpose that Navajo proposes is to be used, then Saddam can very well enter an insanity-plea.
I don't agree with the death penalty. However, if he is found guilty and the crimes he comitted are recognized by iraquian law (not american or american dictated or new americanized) as deserving of DP, then he must be executed, just to respect iraquian state of law.
However, if the laws that will put Saddam on trial were written by himself, during his ruling, then those laws should not be applied. Why? Because Saddam was an illegitimate ruler, hence what he does must be removed. So new laws will have to be dictated. The only problem with this is that those new laws will be totally americanized, and most likely, will use the Commonlaw system, instead of the vastly superior Roman germanic system. The new laws will probably be a carbon copy of american laws, and that, under any point of view, is wrong. Other problem would be that, for a new, totally iraquian set of laws to be written, at least 3 or 4 years might be needed.
I am sure that, one way or another, Saddam will be executed, legally or not.