Pidgin

Gaim : A multi-protocol instant messaging (IM) client

Gaim has been renamed to Pidgin.

Pidgin is a GTK+ instant messaging application for Windows and Unix. It supports AIM, ICQ, Jabber/XMPP, MSN, Yahoo!, Bonjour, Gadu-Gadu, IRC, QQ, SILC, SIMPLE and more.

http://pidgin.im/

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Have buddies with more than one IM account? You can combine them so that they take only a single spot on your buddy list which you can expand when necessary.

You can now format your messages with WYSIWYG capibilities---no more distracting HTML tags.

Gaim is as configurable as it needs to be. It provides plenty of options to suit your tastes, but doesn't bog you down with needless options you're not likely to care about.