Agile IT has been widely heralded (and equally widely decried) as a way to align the pace of change in IT with the pace of change in the broader business.
At its core, Agile IT is making the very basic point that if in house IT cannot keep pace with the business there are a rapidly increasing number of cloud and SaaS providers for whom that is not a problem.
In short, IT must innovate around time to market or die a death of a thousand credit card cuts as individual developers outsource the IT they need to Amazon and other public cloud providers.