One possible contributor is Amazon Web Services. The revenue from AWS is currently hidden under 'other' in the company's earnings reports, but analysts believe

One possible contributor is Amazon Web Services. The revenue from AWS is currently hidden under 'other' in the company's earnings reports, but analysts believe it comprises most of that category, which totaled over $500M this quarter, a 58% increase over Q4 last year. That means AWS was close to a billion dollar business in 2011 and will certainly surpass that in 2012. Besides being an even faster-growing market than online retail, it's likely that the AWS margins are higher than retail as well.