Download Messenger

New Messenger 10 Futures:

Instant message with one friend, or conference in a bunch
Easily find or invite friends from other services to come chat with you
All-new Insider with Yahoo! Mail, news, weather, search and more
Send text messages (SMS) to friends’ mobile phones for free*
Show your style with emoticons, Avatars, audibles and IMVironments
Use the built-in media player [...]

Google Talk – Google IM client

Text chat
- Status updates: see if friends are around and what they are up to
- Instant messages: share quick thoughts in real time
- File transfer: instantly send and receive files, pictures, and more

Voice chat
- Audio conferencing: talk to multiple people at once
- Free long distance: make PC-to-PC calls to people [...]