SIM-IM is a plugin-based instant messenger with support for various 
protocols (QT is needed, can be build for KDE).

All protocols support richtext-messages, file transfer, typing
notification, server-side contact list (with postponed synchronization
- you can change contact list in offline mode and after log on all
changes will be synchronized with server), new account registration
and various searches.  You can use several accounts for each protocol.

Supported protocols:
    * Oscar - ICQ and AIM support
    * Jabber
    * MSN
    * Yahoo!
    * LiveJournal

WWW: http://sim-im.org/