Gmail is popular email service provided by www.google.com
Recently Gmail.com added chat feature to Gmail. That is you can chat with any one with a Gmail account instantly with out any additional software like Yahoo Messenger or MSN Messenger. Its great cool feature. I am sure this will be going to a hit very soon.
When you are loged in to Gmail account, your status is set to online. Anyone can contact you easily. Its great as no software need to be installed, just login to gmail with any browser. I have tested with with Internet Explorer and FireFox, both worked fine.
Chat with Gmail is a good reson for sending gmail invites to your friends. Gmail also allow you to send email from your own domain name. So just forward all emails to Gmail and use it for sending emails. Gmail have very good spam filtering. I only get few spam mails in my gmail account compared to Yahoo Mail.