Like i've said before, war gives a free pass to sadists, enabling them to act upon their own twisted fantasies in the name of a 'cause'. This action pretty much drives that point home (Abu Gharib is another example).
Don't think for two seconds it was about 'fighting the infidels', it was a thrill kill, nothing more. I've read the Koran as well. Allah would not be pleased by this, no sir.
Furthermore, I strongly doubt it was indicitive of the attitude of those resisting the American presence. This was the action of a tiny group of individuals, not the whole of yonder resistance. Unfortunately, like Abu Gharib, the actions of these dipwits brings shame on the whole resistance movement. If anything, their action guarantee there will be no negotiations. Way to go.
One more minor detail, after I shot off my yap, is the body in the tape (or I've also read one was found already), confirmed as being hers?