Many of today's cutting-edge companies are looking to leverage cloud computing where possible - to build customer-facing apps, CRM apps, Professional Services automation, etc. However, those same companies are simply not comfortable outsourcing some of their applications - such as order management, warehouse management, and critical banking or trading applications - to the cloud.  This stands to reason; these systems are either part of these organizations' set of differentiators or are simply too difficult to place outside of their "four walls".