Google Talk is a lightweight Jabber-based instant messaging client with voice capabilities. Google Talk is easy and intuitive to use. All you need to make free calls is an Internet connection, a microphone and loudspeaker. After downloading Google Talk, sign in with your Gmail username and password. Invite your friends to download Google Talk, and once they do, you'll be able to talk or IM with them instantly.

download:Google Talk v1.0.0.105