Om Malik posts an article written by Daniel Berninger, recently a senior analyst at Tier 1 research, over on his blog. This is a great article outlining the "VoIP insurrection, the best and most definitive essay you will ever read on this technology, where it is headed and why it is important."
The VoIP insurrection over the last decade marks a milestone in communication history no less dramatic than the arrival of the telephone in 1876. We know data networks and packetized voice will displace the long standing pre-1995 world rooted in Alexander Graham Bell's invention. It remains uncertain whether telecom's incumbent carriers and equipment makers will continue to dominate or even survive as the information technology industry absorbs voice as a simple application of the Internet.