Vonage... charges a flat rate of $24.99 per month for unlimited calling in the U.S. and Canada
Using the *free* skype.com software I can talk, computer to computer, to anyone else who also has skype. I can reach any Skype user on the globe and talk for free. I use it to talk to my daughter, who is in graduate school in Ireland.
For about 2 cents/minute I can use Skype to call from computer to a phone (cell or land-line) for pretty much anywhere on the globe. All my long distance calls to TELCO numbers are now made with Skype.
My Skype investment? About 30 USD for a usb headset.
Why would I pay Vonnage charges for their limited scope of US and Canada when I can use Skype? Do the math!