A nice article i would recommend you to read:
IT as a Service Broker – Adopting a Hybrid Delivery Model — The “cloud era” of information technology is upon us. Connectivity is pervasive and everyone and everything is connected. Readily available, low-cost, Internet-based services providing access to new capabilities and infinite amounts of information have given rise to a new set of experiences and expectations for technology users. Furthermore, a new generation is entering the workforce, one that has grown up with technology at their fingertips, one that expects immediate gratification and instant results and one that is ambivalent to traditional IT controls. These tech-savvy business users are mixing the technology experiences from their consumer lives with those of their profession to morph into a new “prosumer” workforce. And they are able to drive game-changing innovation without a dependence on IT intervention. This is the reality of the cloud computing economy; it’s the forcing function behind the creation of new goods and services, new business models, new routes to market, and new ways of engaging customers. Simply put, cloud services are the enablers for the next frontier in business and government, one where technology-enabled services are easily sourced and woven into the enterprise fabric. However, cloud sourcing can also introduce new levels of complexity and business risk without the appropriate levels of integration and governance. This has given rise to a new class of service provider – the cloud service broker.