if you've discovered the usefulness of Instant Messaging you may be using whatever software first came to hand. But there are many choices available, as Read/WriteWeb point out in their Instant Messaging Round-Up:

… we've listed a large number of online and offline instant messengers, as well the various protocols supported by each, so that you can more easily find the one that's right for you. … (Note: we did not link to any official offline clients.)

Mentioned are: Meebo, FlickIM, Kool IM, eBuddy, ILoveIM, RadiusIM, Imo.im, Mabber, IMUnitive, Snimmer, EasyMessenger, MessengerFX, IMhaha, Google Talk, Yahoo! Web Messenger (web.im), MSN Web Messenger, AIM Express, ICQ2Go, JWChat - Jabber Web Chat, Trillian, Pidgin, Adium, AirTalker, Miranda IM.

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