There have been many products and services making great promises to the enterprise developer, and a lot of the chatter about cloud computing at times makes it seem like this is yet another buzzword that will pass. Looking at the companies that have made the move to the various cloud platforms makes us think otherwise. Even before its official release, companies such as Domino's, Kelly Blue Book, and Coca-Cola Enterprises had already adapted applications for Azure, and many more case studies were posted from PDC 2009. To underscore the flexibility of the Azure platform, Domino's application is written in Java and served by Tomcat.

No cloud computing platform can be all things to all people. Each platform differs in its capabilities and service offerings, and price can be a factor as well. Enterprise applications typically include a database back end, and Google's lack of a relational database and limited language support (Python and some flavors of Java) make it a tough sell for enterprises that require a full database and use .NET technologies. With Amazon's services, we need to build our own virtual machine (or start with a pre-built one), but we are still responsible for licensing costs, removing the price advantage. Microsoft's Azure platform is designed to be a very happy medium–a wide range of languages can be used, there are no licensing costs, and Azure has some advanced features such as Access Control and Service Bus not found in other cloud offerings. One thing is for sure–with three big players in the cloud computing game, the services will become more feature rich, less expensive, and in the end, the consumers will benefit greatly.

The presence of so many large applications in the cloud is not proof positive enough to conclude that cloud computing is the way of the future, but such rapid adoption speaks well of the advantages of cloud-based applications, especially the time to develop them. The promise of cloud computing platforms is that they are stable, scalable, easy to develop, and are cost effective. Time will tell which providers perform the best, but even at this early stage there are plenty of case studies to observe.