The Iraq Coalition Casualty Count records all military casualties; Pentagon and DoD apparently don't count it if, for example, a soldier comes under fire, crashes the Hummer and is killed.
This record does not appear to reflect non-military casualties, such as, again for example, the Kellogg Brown & Root employee who was killed last month when his vehicle exploded.
And no one I can ascertain is keeping track of Iraqi casualties, civilian or otherwise.