ICQ (or 'I Seek You') is an instant messaging service to find friends, colleagues and people with similar interests.
With ICQ Instant Messenger you can video/audio chat, send email, SMS, and wireless-pager messages, as well as transfer files and URLs. If you're away from your personal computer you can still chat with friends and contacts, even where the ICQ client is not installed, by using the web-based ICQ2Go that works from any computer.
You can customize your ICQ to be exactly what you need and always up-to-date by adding shortcuts to your favorite features in order to launch them directly from your ICQ. This means that you can send your friends & contacts greeting cards and invitations to games, multi chats, video sessions, and more directly from your client and/or the message window. In the message window, you can also choose to display your photo or one of ICQ's unique, animated devils.
ICQ phone incorporates IP telephony functions enabling you to engage in PC-to-PC and PC-to-phone calls. Used in multiple-user mode, groups can conduct conferences or play games with ICQ. In fact, ICQ supports a variety of popular Internet applications and serves as a Universal Platform from which you can launch peer-to-peer applications.
Basically, ICQ brings together the most widely used methods of communication in the simplest way.
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PAF Portable (not fully tested because I don't have an ICQ account and I refuse to make one)
http://www.upload.ee/files/5827192/ICQPortable_10.0_Build_12061_English.paf.exe.html