How Big is Amazon’s Cloud Computing Business?

"It goes without saying that with its array of web services, Amazon has transformed the computing landscape and nurtured what is generically known as the cloud computing industry. By turning expensive storage and computing hardware into a billable service, it has opened up new vistas for entrepreneurs and made corporations rethink how they build and use their computing and storage resources. The question often people ask: How much money is Amazon making from these web services? I’ve heard some wild estimates." Read the rest.