My bf discovered a new messenger while browsing the net recently and it's pretty darn cool!
With this one, it connects you simultaneously to yahoo, msn, aim, and ICQ messengers all in one instead of having separate ones! It also seems to have automatic translation so you can chat with others around the world in your respective tongues and understand each other (I haven't tried that yet)!
Thought I would share
Here is the link to the site and all the info: