About $900 billion of US taxpayers' funds has been spent or approved for spending through November 2010. $9 billion of this money is lost or unaccounted for, as per ABC News.

In 2009, the U.S. monthly Spending in Iraq was $7.3 billion (as of Oct 2009)

In 2008, the U.S. monthly Spending in Iraq was $12 billion

U.S. Spending per Second - $5,000 in 2008 (as per former per Senate Majority Leader Harry Reid)

Congressional Research Service puts the cost of deploying one U.S. soldier for one year in Iraq as $390,000

Casualties and Troops in Iraq
As of Nov 30, 2010, there were a total 47,000 U.S. troops in Iraq. All other Nations have withdrawn their troops.

As per The Washington Post, there were more than 180,000 Private Contractors in Iraq in August 2007

4,439 US troops are dead and and additional 32,033 are wounded, 20% of which are serious brain or spinal injuries. (Total excludes psychological injuries). 30% of US troops develop serious mental health problems within 3 to 4 months of returning home

So far, 147 Journalists have died in Iraq (14 of them by US Forces), and Iraqi Police and Soldiers casualties stand at 9,830.

A UN issued report dated Sept 20, 2006 stating that Iraqi civilian casualties have been significantly under-reported. Casualties are reported at 50,000 to over 100,000, but may be much higher. Some informed estimates place Iraqi civilian casualities at over 600,000.