I gave a talk at Cloud Expo at the London Excel centre yesterday on the need for a much more dynamic perspective towards cloud computing. V3.co.uk have written an article providing an excellent summary of the talk if you are interested:
http://www.v3.co.uk/v3-uk/news/2454551/enterprises-must-be-ready-to-evolve-alongside-cloud-services

Dr Will Venters, assistant professor of information systems at the London School of Economics, explained that companies integrating cloud services into their IT infrastructure need to establish fluid partnerships with multiple vendors, as opposed to purchasing a static product….