Meebo

I'll step away from the freeware world for a second and mention a great website to access all your IM clients in one easy stop. Meebo.com is an open site where you can log in to your live messenger, myspace, facebook, AIM, ICQ and yahoo! accounts all at once. You can choose to use the clients individually or sign up for a meebo account for one umbrella account to easily log in to all your IM clients with a single username and password. So check out Meebo here, it's a great way to get around computers that block IM clients or don't allow new software installations.