“The potential benefits of public clouds are obvious to most IT execs, but so are the pitfalls – outages, security concerns, compliance issues, and questions about performance, management, service-level agreements and billing. At this point, it's fair to say that most IT execs are wary of entrusting sensitive data or important applications to the public cloud.”

http://www.networkworld.com/reviews/2010/040510-cloud-computing-test.html