Instan-t Messenger 5.0 is a free instant message client from Interactive Networks that allows you to sign into MSN, Googletalk, ICQ/AOL, and Yahoo all at same time. Simply download Instant-t, create a username and then add your username and password for your other messenger accounts and every time you sign in with Instant-t, you will sign in to your other accounts as well.
Features:
* New multiperson video chat
* Interoperability with Google Talk
* Multiple ways to see your contact list
* Support for tabs in message window
* Contact list search
* Rename contacts on all networks
* Display picture
* Custom status text
* Webcam as display picture
* Improved toaster (online notification)
* New skins (Classic and Dusk)
Try Instan-t messenger here