Digsby - IM + Email + Social Networks

digsby is a 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. It is also 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. It also alerts you of new email and lets you perform actions such as 'Delete' or 'Report Spam' with just one click.