I've installed the ezmlm.idx contrib and got it working. You need to install the standard ezmlm-idx-std-0.40-2.i386.rpm
and then the e-smith rpm
e-smith-ezmlm-idx-0.1.3-12.noarch.rpm
They are in /contrib/GordonRowell/RPMS/noarch and /contrib/GordonRowell/RPMS/i386
respectively.
They setup an interface for the manager, but it's rudimentary (though improving thanks to some input from Gordon recently) - you'll still need to do some commandline work.
WARNING - trap for beginners (ie me!) - you must perform any ezmlm commands such as ezmlm-make as the ezmlm user, so do
sudo -u ezmlm -s prior to performing these commands.
If you don't you'll stuff up the install and will have to remove it and reinstall it.