Palringo

Palringo is a multiplatform instant messaging client that allows you to chat with your contacts using different IM networks including MSN, Gmail, Yahoo MSN, AOL, Jabber or ICQ at the same time.

Main advantages of Palringo have to do with the low resource consumption and the very well organized and intuitive interface.

You only need to login using your different accounts for the different IM netwroks and you'll decide whether to view your contacts sorted by networks or all together.

As you can check, it can be really useful if you have different accounts and you don't want to have different IM clients running at the same time. Just use one to control all of them.