From the Connected World report:

Another sign of upheaval in the connectivity landscape is the presence of “switch backs.” Digital visionary Nicholas Negroponte predicted over a decade ago that wired services would become wireless, and wireless services would become wired – dubbed the Negroponte Switch. Now we see many “switch backs” in play. For example, VoIP (Voice over IP) brings phone calls from wired to wireless and now back to wired. Mobile TV brings TV from wireless to wired and now back to wireless. The Negroponte Switch could still be the end state, but currently we are seeing numerous switch backs, illustrating the very unsettled nature of the connectivity landscape.