The NO:1 search engine enters in to Instant Messengig(IM) called Google Talk. It is free to download, just 899KB file and easy to install,less than 1mints to install. It will add your g-mail friends automatically from your address book or you can manualy invite them. If u & your friend have speaker and mic then you can also launch a voice conversation. If you didn’t have a g-mail id yet,dont worry about that;just send a mail to email@example.com. I will invite you.
Download Google Talk from http://desktop.google.com/download/googletalk/googletalk-setup.exe
To know more about Google Talk visit www.google.com/talk