Security is certainly the most prominent concern going right now with cloud computing. Having a long memory of dodgey connectivity using dial-up and even DSL lines, just making certain I could get to my data, services, et.al. in the cloud remain something of a personal concern.
From the link:
The hype around cloud computing would make you think mass adoption will happen tomorrow. But recent studies by a number of sources have shown that security is the biggest barrier to cloud adoption. The reality is cloud computing is simply another step in technology evolution following the path of mainframe, client server and Web applications, all of which had — and still have — their own security issues
Security concerns did not stop those technologies from being deployed and they will not stop the adoption of cloud applications that solve real business needs. To secure the cloud, it needs to be treated as the next evolution in technology not a revolution that requires broad based changes to your security model. Security policies and procedures need to be adapted to include cloud models in order to prepare for the adoption of cloud-based services. Like other technologies, we’re seeing early adopters take the lead and instill confidence in the cloud model by deploying private clouds or by experimenting with less-critical information in public clouds.