Finally, here's your shortlist (9 anyway) for consideration or adoption of a cloud vendor. These are the current "premier" companies in my opinion and should be considered by any serious cloud adoption strategies. The key differentiator may be public vs. private cloud. And don't forget, these are Infrastructure as a Service providers, not mere hosting companies like WordPress or SaaS providers like Salesforce.com or Intuit.
10 most powerful IaaS companies