This paper (registration required) provides an overview of cloud computing, analyzes ongoing trends and provides guidelines for planning and evaluating enterprise cloud solutions, starting with private cloudsand internal cost assessments
"Theres been a thunderstorm of white noise surrounding cloud computing this year. Vendors, pundits, and analysts took center stage at industry events and in the news; everyone seems to have an opinion and definition on cloud computing. And with all the chatter came mixed messages, conflicting advice and, well, cloudiness. "There is good news: its time to filter out the hype and confusion. While still evolving, cloud computing is here to stay. CIOs need to be ready."