Three top picks for cloud computing companies?

for example , google i think is one , what are two more?Three top picks for cloud computing companies?
First, a definition of "cloud computing":



"Utility computing ... also called cloud computing, on-demand computing and software as a service [SaaS] ... exists when the user accesses software and/or data from computing resources located on the network."



There are such a wide variety of options available that you may wish to clarify further what you're looking for. Two examples:



If what you're seeking is online storage and processing cycles, perhaps for a Web-based startup company, you might look into Amazon Web Services (e.g. S3, EC2):



http://aws.amazon.com



If what you are looking for is a SaaS customer relationship management (CRM) system, one obvious option is Salesforce.com:



http://www.salesforce.com



Some advantages of SaaS:



http://www.smallbiztrends.com/2007/12/so鈥?/a>



The primary disadvantage is that you've put your eggs into a "cloud" basket; if your provider's service goes down or is otherwise unreachable, your business may be dead in the water for a time. Some thoughts on this:



http://radar.oreilly.com/2008/07/oscon-d鈥?/a>