meebo.com is a website for instant messaging from absolutely anywhere. Whether you’re at home, on campus, at work, or traveling foreign lands, hop over to meebo.com on any computer to access all of your buddies (on AIM, Yahoo!, MSN, Google Talk, ICQ and Jabber) and chat with them, no downloads or installs required, for free!
It works really well and the interface is very cluter free and user friendly. What's more, they allow you to create widgets for your site / blog so people can send you chat messages from your blog directly to your meebo page, if you are logged into meebo at the time you can have an IM chat with your visitors.
I've added one to this blog so feel free to send me a message!