I downloaded this the other day after seeing it on bbc news 24. very handy tool it lets you have One combined buddy list for all your AIM, MSN, Yahoo, ICQ, Google Talk, Jabber, and Facebook Chat Accounts..
lets you Manage your Hotmail, Gmail, Yahoo Mail, AOL/AIM Mail, IMAP, and POP accounts right from digsby.
Get popup notifications when new email arrives. Clicking a popup takes you right to the message with auto-login into webmail accounts. Stay up to date with everything happening on your Facebook, Twitter, MySpace and LinkedIn accounts.
Receive alerts of events such as new friend requests, messages, group invites, etc.


DOWNLOAD HEAR

Instant Messaging
One combined buddy list for all your AIM, MSN, Yahoo, ICQ, Google Talk, Jabber, and Facebook Chat Accounts.
Manage multiple conversations with tabbed conversation windows. You can drag tabs out into their own windows for important conversations.
Rename contacts with an alias so you don't have to remember buddy names like 'giantsfan123'.
If one of your friends has more than one IM account you can combine them into a single merged contact to eliminate duplicate buddies.
Send your friends SMS messages right from the IM window.
The InfoBox lets you check everyone's status message and profile just by moving your mouse down the list.
Changing your status has never been easier. just one click right on the buddy list!
Multitask while you chat. Minimize the IM window and you see popups of new IM's. Best of all, you can reply right from the popup and get back to what you were doing.
Log conversation history and find the information you need our search-enabled log viewer.
And so much more.


Email
Manage your Hotmail, Gmail, Yahoo Mail, AOL/AIM Mail, IMAP, and POP accounts right from digsby.
Get popup notifications when new email arrives. Clicking a popup takes you right to the message with auto-login into webmail accounts.
The email InfoBox gives you a snapshot of your unread messages with just one click
Perform actions such as "Mark as Read" or "Report Spam" right from the email InfoBox.
Send emails to your friends right from the IM window. The email is sent directly from any account digsby is tracking for you.


Social Networking
Stay up to date with everything happening on your Facebook, Twitter, MySpace and LinkedIn accounts.
Receive alerts of events such as new friend requests, messages, group invites, etc.
The social network InfoBox gives you a real time NewsFeed of what your friends are up to. Everything from new photos, to status updates, to upcoming birthdays is just a click away.
Set your Facebook, Twitter and LinkedIn status right from Digsby.


Personalize
Customize digsby with application skins to give it a personal look and feel.
Change the way your conversations look with themes – everything from simple AIM-style windows to 3D conversation bubbles.
Complete control over the layout of buddies on the buddy list. Change everything from buddy icon size to whether or not to show a snippet of their away message.
Sort your buddy list how ever you want! You can organize buddies manually, by status, by service, by name or by log size to place those you communicate with most at the top. You can even choose a secondary sorting method.
Customizable notification system lets you choose what events you want to be alerted about and how.


Other
Digsby offers complete synchronization between computers and installations. Everything from the skin you chose to your pre-defined status messages follows you from place to place.
You can place a widget on your blog, website, or social network profile so you can chat with visitors right from digsby.
Manage multiple simultaneous file transfers from one simple transfer manager.

There's also something called Pidgin which does much the same thing.

mainly a linux thing tho pidgin