Google Talk

Google Talk is a simple and free way to talk with and send instant messages to your friends. Like Gmail, Google Talk uses Googles innovative technologies to help people communicate more effectively and efficiently. Think of it as Googles approach to communications. Google Talk is easy and intuitive to use. All you need to make free calls is an Internet connection, a microphone, and a speaker. After you download Google Talk, sign in with your Gmail username and password.

Invite your friends to download Google Talk, and once they do, youll be able to talk or IM with them instantly.

Features
Instant messaging — Chat with all of your Google Talk and Gmail contacts in real time.

Send and receive voicemails— If the person you are calling is not available, you can leave a voicemail.

Unlimited file transfers — Send files to your contacts. There are no file size or bandwidth restrictions.

Free PC-to-PC voice calls — You can talk to anyone else for free who's online and has the Google Talk client.

Gmail notifications on your desktop. When you are signed into Google Talk, you will be notified of new messages in your Gmail inbox.