Just FYI, the $631 million number is for 2011, not 2012.

http://finance.yahoo.com/q/is?s=AMZN&annual

2012 appears that it's going to be a net loss, because of their horrible Q3 numbers.

http://finance.yahoo.com/q/is?s=AMZN

If I were an investor in Amazon, I would definitely be worried at this point. Even though revenue is up sharply, Amazon doesn't appear to be making a consistent profit at all-their net income was down 50% from 2010 in 2011, even though they had a ~33% increase in revenue.