NYTimes - May 6, 2010
NOAA has not estimated the total amount of oil spilled. But the spill has been unfolding for more than two weeks at an estimated rate of 210,000 gallons a day; a highly speculative estimate would be 3.3 million gallons so far.
http://www.nytimes.com/2010/05/07/science/earth/07questions.html