Voip is going to get even bigger down the road.
We are looking at starting our own voip phone company right now, will see how it turns out.
I have been using packet8.net for months and the call quality, voice mail, features for $20.00 per month can't be beat.
Unlimited calls to anywhere in the usa / canada. We ship the ata (voice) adapters to employees overseas, and I just dial a local portland # to call them
Same if they want to call me.
All that anyone needs to use these anywhere in the world is a broadband connection, i.e. dsl,cable, wireless network, t-1's, etc.
voice mail can be checked from anywhere, and you can also have your voice mail sent to your email box, i think in wav or some file.