Fellow Debian users, This is by far the best way I have found of dealing with the troublesome libc6 2.2.4-2 package. Simply edit the file named '/etc/apt/preferences' and add lines like mine shown below. Now everything should update easily and you can run galeon and mozilla again. Also, see man apt_preferences(5) for more info.
file:/etc/apt/preferences Package: libc6 Pin: version 2.2.4-1 Pin-Priority: 1001 Package: libc6-dev Pin: version 2.2.4-1 Pin-Priority: 1001 Package: locales Pin: version 2.2.4-1 Pin-Priority: 1001 -- Jeremiah Mahler <[EMAIL PROTECTED]>