re: The Lancet study...
Iraq Body Count, as far as I can determine, tallies only civilian deaths - the Lancet study tried to determine all Iraqi deaths. I've see estimates of 40,000 Iraqi military deaths in the major fighting, and I don't know if IBC includes "insurgent" deaths, which must be significant in number. All things considered, a total of close to 100,000 Iraqi citizens, both civilian and military doesn't seem unreasonable.
But even IBCs 30,000 or so number is horrific.