Research suggests that the appetite for [communications] services has not reached its limit: American families are spending only about half as much as they say they would be willing to pay for technologies that would perfectly meet their needs. ... What all these emerging services have in common is a business model based on subscriptions that are billed monthly or yearly. What the most successful services will share is an appeal that will quickly evolve from intriguing to compelling to essential. The future will not be advertised. It Adds Up (and Up, and Up) | 
