If you are new to this debate you might want to join EA Connections, chaired by Steve Melville who penned the following words….
Your value proposition sets expectations with potential customers. The  more compelling your value proposition, the larger the pool of  potentially interested customers and the fewer competitors that can  match it. So, the goal is to create product and service offerings that  set expectations that more customers find compelling and few competitors  can match. In so doing, you have re-set the bar for customer  expectations within your market and created the foundation for your  organization’s success.
But here’s the catch… you have to deliver against those expectations.  One failure and you begin to lose your customer’s trust. You lower their  expectations with your actions, regardless of your lofty initial  promises of value. And, with the explosion of social networking, blogs,  24 hour news channels, online reviews, etc., any failure to deliver  against expectations, gets broadcast pretty quickly. Ask BP or Toyota  what happens when you fail to meet customer expectations of safety.
So… to match the high expectations of your value proposition, the  delivery processes of your organization need to consistently meet those  expectations. And it is in the design and deployment of those delivery  processes that the critical dependency on EA surfaces. For, in the 21st  Century, such processes are heavily dependent on technology: 
eCommerce and online support sites, mobile applications, ERP systems,  RDBMS, SOA, SANs, etc. And not just some delivery processes, Outside-In  companies recognize that the entire enterprise needs to be focused on  delivering successful customer outcomes.
So the challenge becomes to align all of the process, application,  information and technology resources across the entire enterprise to  deliver successful customer outcomes in order to support higher and  higher customer expectations. And alignment is the sweet spot of  enterprise architecture. EA is the right fit because both its sweep  (across the entireenterprise) and its scope (processes, information,  application, and the technology that supports them) match the demands of  the Operational Framework Layer of the Outside-In enterprise.
Come on down to the Linkedin discussions:
Join the BP Group http://bit.ly/joinbpgroup | EA Connections http://bit.ly/EAConnections | Outside-In Resources http://oibpm.com