I realized today from a question I saw on Twitter, not everyone knows about one of the coolest things about Google Voice. You can not only make free calls to and from your landline or you cell phone, but also via your computer.
The person asking the question was afraid they'd have to pay for Skype In minutes to use Google Voice from their computer. They didn't know about the free Gizmo Voice Over IP (VoIP) client interacting with Google Voice.
Some calls just need the kind of hands free I get from computer headphones and the ability to look up information or make notes I do best at the computer.
Google Voice Help tells you all about it. See my other posts about Google Voice.