Yahoo Messenger is a free service that allows you to see when friends come online and send them instant messages.

• Alerts you to new e-mail in your Yahoo Personals account or Yahoo Mail and when you have events recorded in Yahoo Calendar.

• Firewall support.

• Sits in standby mode to minimize the program until an Internet connection is made.

• Save and print your conversations

• Create a chat room automatically

• Get stock price alerts.

• Send messages to friends even if they're not online when you are.

• Quick Compact mode that hides the Messenger tools to maximize your viewing area.

• Messenger Themes, and voice chat allow you to talk for free to anybody else on the Internet.

• Use a Webcam and see who you are chatting with.
  Super Webcam
  Enjoy high-quality, broadband video messaging with your friends!

• New Emoticons
  Express yourself in whole new ways without writing a word!
  
• IMVironments
  More IMVironments than ever before. (PC only)