Regrettably:

In a span of a few hours, 2,973 people were killed in the Sept. 11, 2001, terrorist attacks. In a span of 45 months, the number of American troops killed in Iraq exceeded that grim toll as the war continues.

The milestone in Iraq came on Christmas, nearly four years after the war began, according to a count by The Associated Press. (NYT)

Just going by death toll doesn't give a clear picture of the damage caused by the war, even confining that to American troops: over 25,000 have been injured. Here's a map of US casualties by state.