Without a doubt digsby is something that EVERYONE with internet access should download. For many years I was a trillian user (and a very happy one at that) which is also a brilliant product, just digsby is better. Key features include:

• One combined buddy list for all your AIM, MSN, Yahoo, ICQ, Google Talk, Jabber, and Facebook Chat Accounts.
• Manage your Hotmail, Gmail, Yahoo Mail, AOL/AIM Mail, IMAP, and POP accounts right from digsby.
• Stay up to date with everything happening on your Facebook, Twitter, MySpace and LinkedIn accounts.
• You can place a widget on your blog, website, or social network profile so you can chat with visitors right from digsby.
• Full Feature List

You are also able to insert widgets into your website to enable instant interaction with any of your website users (like this one –>), in which as soon as you view this page, I can see you and more importantly, chat with you.

To get the latest version of digsby download it here