From a pragmatic perspective, new technologies must be ready for prime time and provide tangible benefits before they're useful. WF hits the mark on both points. Of all the .NET 3.0 technologies, WF is the most complete in terms of functionality and design-time experience. Here are some of the benefits you reap from WF:
It provides a higher level of abstraction and visual representation of your business processes that make them easy to create and understand—both by developers and business domain experts.
It's easy to change the flow and rules associated with business processes, often without having to recompile.
WF ...