I have been thinking about Services and how Services can have tangible business benefits.
First of all I began by thinking about project milestones and a specific realisable business benefit per milestone. The following benefits came to mind:
There is a great slide from the www.netfx3.com site introduction to WCF found here
Function oriented: Built to last, prolonged development cycles, tightly coupled, application silos
Process oriented: Build for change, incrementally built and deployed, loosely coupled, connected systems
and the business drivers: Agility, Adapatability and Total Cost of Ownership