I came across a very interesting cloud computing security study from the Ponemon Institute (sponsored by CA, but independently carried out by Ponemon). The study is based on a survey the Institute carried out, responded to by around 900 people.
The survey results are as one might expect: IT professionals trust the security of on-premise computing more than that of cloud computing providers. But buried within the detail of the survey are some pretty interesting stats, to which I will turn momentarily.
http://www.techworld.com.au/article/346842/cloud_computing_security_it_take_state_pla
With regard to the Ponemon Report, it should be required reading for every security professional concerned with cloud computing