Google Voice
More over a year back, google released an
early preview
of Google Voice, a web-based platform for managing communications. To try it out, one needed to request and receive and invite to try it out. Now after some hard work of testing and tweaking, Google Voice is opened to the public, no invitation required.
Check out the revamped
features page
of Google Voice to learn about everything of its power. The video above provides a good overview in less than two minutes.
A quick context diagram, infographic created created by Google visualize some recent history of human communication and how Google Voice uses the web to help communicate in more ways than ever before.

Source (Read more at) : http://weeklysmashing.blogspot.com/2010/08/google-voice.html