So I've been banging this VoIP mashup drum pretty hard. I came across this video with Sue Teller, and I've got to tell you, I think she gets it more than nearly any telecom executive I've ever met. As I watched this, I wasn't sure if she was serious or not - you tell me. Either way, I think you'll enjoy this.
By the way, I think the word mashup really captures what this all about. If we can take two things and re-purpose them easily, then we have blown our flexibility as application designers through the roof. The twin advantage of inexpensive development and exponentially increased freedom not only results in innovation, but cost savings.