What's Inside the Cloud?: An Architectural Map of the Cloud Landscape

Cloud computing is emerging as a model in support of "Everything-as-a-Service" (XaaS). Virtualized physical resources, virtualized infrastructure, as well as virtualized middleware platforms and business applications are being provided and consumed as services in the Cloud. Engineering software systems that use "Everything-as-a-service" and which in turn may be provided as Cloud services themselves, however, requires a good understanding of the numerous emerging Cloud computing technologies as well as of already available services solutions offered in the open Cloud market.