Digsby is multifunctional, multiplatform software which allows you to have Instant Messaging, Email Notifications and Social Networking in one.
You can get it here:
http://www.digsby.com
Digsby is:
* multiprotocol IM client that lets you chat with all your friends on AIM, MSN, Yahoo, ICQ, Google Talk, and Jabber with one simple to manage buddy list.
* an email notification tool that alerts you of new email and lets you perform actions such as 'Delete' or 'Report Spam' with just one click.
* a social networking tool that alerts you of events like new messages and gives you a live Newsfeed of what your friends are up to.
Check out main features via their screenshoots
http://www.digsby.com/screenshots.php
But also you should know how they are keeping Digsby Free and Ad-Free
http://blog.digsby.com/archives/68
http://lifehacker.com/5336382/digsby-joins-the-dark-side-uses-your-pc-to-make-money
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