I've it working! (do not have YET a web interface)
What I did:
1) created a new dag5 repository (because I'm on SME8b6).
If you're on SME7.x you need a common dag repository (change dag5 to dag and el5 to el4 on line below):
/sbin/e-smith/db yum_repositories set dag5 repository Name 'Dag - EL5' BaseURL 'http://apt.sw.be/redhat/el5/en/$basearch/dag' EnableGroups no GPGCheck yes GPGKey http://dag.wieers.com/packages/RPM-GPG-KEY.dag.txt Visible no Exclude freetype,htop,iptraf,rsync,syslinux status disabled
and tell yum to install it to me:
yum install mplayer --enablerepo=dag5
(again, if you're on SME7, use dag instead of dag5)
after that, mplayer anysong.mp3 would play in your servers speakers.
I'm trying to install webmplayer interface on it now... more to came!
Jáder