One of my main interests is Voice over Internet. If you have high speed Internet (HSI), you can leverage inexpensive phone service. I personally have not had a Plain Old Telephone System(POTS) since 2004. I began with iConnectHere.com, then Vonage, BroadvoxDirect.com, Vonage(again!), Packet8.net, and currently use VOIPo.com
VOIPo is a newer company. The founder, who can be reached on the VOIPo forums, goes by the name VOIPoTim. Tim was an executive of HostGator.com, a major Web Host company (this site uses them). I was lucky to beta test the VOIPo service. The up-front Management style impressed me very much. The vision of Tim is on the scale of Vonage, but their contact with customers, I feel, will result in more useful, better attuned service.
You can read my review at DSLReports.com