Meebo is an online chat client that allows you to connect to all the popular chat protocals. Why would you need this, well it is great for all those companies that have IT block the protocal ports. Here at work for instance, they only allow Yahoo to be used, but using Meebo I can connact to all the other chat protocals at once and use Port 80 to chat with my family and friends anyways. Don't let the man keep you down :)
Check it out here.