There are indications that civilian killings in Iraq decreased by 50% in September. Yet it still reached a figure of 844, plus 78 police officers and Iraqi soldiers. Some 70 Coalition troops also lost their lives. Such deaths are currently down to "only" 30 a day.
The hideous methods used in murdering people is shown here for terrorists (but note the warning) and for mercenaries here.
On the Congressional investigation into the Blackwater Security Company, see here.