See Full Story
As many active users of IaaS can tell you, IaaS, whether implemented by an external service provider or provided by an internal service provider team, arguably grants you much more control of the underlying technology "substrate" than other cloud deployment models. In some cases, this is a good thing; for example, when you have unique legacy constraints or technology requirements that must be satisfied for applications to work properly. This control over the environment is generally perceived by customers as a security and operational benefit.
Sprawl is a bit like the stuff that's left over in nuclear reactors - it's dangerous waste. I've read a lot recently about IT departments and their strategies being sidestepped through use of cloud applications and Ed has highlighted another aspect of this albeit a possibly less intentional one. Heed his warnings - the auditors are coming! I found this useful when mine turned up and I had to create and action plan http://ow.ly/9SKRM