Cloud computing has now become widely adopted in many commercial and research organizations as a means to grant access to computational and data resources and to address Quality of Service (QoS) needs of many user communities. With the increasing emergence of new Cloud computing offerings, it becomes necessary to fully understand how these relate to the requirements of emerging usage areas and applications. It is therefore necessary to consider open management aspects of existing Cloud offerings, such as interoperability, scalability, reliability, power management, and confidentiality/auditability, with the final goal to increase the maturity of Cloud technologies and increase subsequent uptake.