Yesterday Google has enabled voice calling from your Gmail account. I gave it a try today and it works really well. It is convenient, easy and calling U.S. and Canada cell phones/land lines is free till the end of the year. This is definitely a great addition to gmail and will bring in more users. The call quality is very good. I used a Netbook to call my cell phone and the audio was excellent. Google mentioned that this feature is only available for U.S. users, but many people outside of U.S. said it already worked for them. If Google will play its cards right they can have a great product that will generate revenue in the future. VOIP is a lucrative market especially if you already have a user base of millions of people.