When Zev Laderman wanted to position his business analytics software and consulting firm in the center of the cloud world, he set his sights on Amazon.com. Amazon.com (AMZN), the world's largest online retailer, also runs the leading infrastructure-as-a-service business. The IaaS unit, Amazon Web Services, gives companies access to thousands of servers to scale up operations, host websites and more. Users pay as they go. Companies access their