Google phone manager - the threat of telecom companies

Google Voice, which will be available to the public in a few weeks, will allow you to use one phone number and redirect all calls to home, work and mobile phones from it at the same time.
A useful feature would be a single control center for all your voice mail.

An important difference from Skype, Google Voice users will access their voicemail from a regular phone. And from there you can dial any number.

Google Voice will allow you to call for free in the States, and quite cheap to other countries.
For international calls to landline phones, Google Voice is generally cheaper than Skype, and for calls to mobiles by almost a third.
At the same time in the service will not be advertising. Tangible savings came from the transition to google servers (previously used the power of the company founder GrandCentral).
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source in English