http://www.icq.comI used to use it, but it's too much of a hassle and less people use it. AOL owns it now, but it still won't connect to AIM. One of the biggest drawbacks in my opinion is the mess called it's website, and the fact you use a number, which is like 10 digits long, instead of a screen name (you can still attach a nickname to your number, but you still can only log in using the number, not nickname.) A good comprimise is Trillian. It connects to AIM, YIM, ICQ, MSN, and IRC. I don't know it's address off hand, but you can google it.