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Google has sent out invitations to its new service called “Google Voice” which basically routes your phone calls thru a new phone number. (Hurry and get your custom phone number! I got mine with my name) The link is http://www.google.com/voice

So whats so exciting about Google Voice? You can call within the US for free. Its like Skype.

No cost to call except in AK, HI:
United States $0
United States, AK $0.04
United States, HI $0.02
United States, Toll Free $0

Their website says:

You can access and make calls from the phone and the Web, block annoying callers at will, and record custom greetings for different callers or groups of callers.

Get an invitation to google voice here:
http://www.google.com/voice

mobile access link for mobile phones:
https://www.google.com/voice/m

This will have an an impact on the mobile phone industry when everyone realizes they dont need their phone plan and can access a free phone via wifi.

update: expect you do need existing phone line to dial out