We just published a new report entitled "The Evolution Of Cloud Computing Markets". It recaps many of the cloud computing market observations from the last two years and categorizes the business models in a consistent taxonomy. Basically all current offerings from pure Infrastructure as a Service, in the upper left, via virtualization tools up to SaaS applications can be categorized by this. We explain the key characteristics of each business model and give vendors guidance to position and communicate their cloud service.
Beyond the preview on this blog, the full document predicts the future market momentum around: