Google.com - Google Talk

Welcome to Google Talk - Google's approach to instant communications.
The Google Talk downloadable application for Windows offers many features for communicating with your friends and family.

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

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

Send and receive voicemails— If the person you're calling isn't available, you can leave a voicemail. Learn more

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

Gmail notifications on your desktop — When you're signed into Google Talk, you'll be notified of new messages in your Gmail inbox.