liquidsoap : A swiss-army knife for multimedia streaming, notably used for netradios. ( http://liquidsoap.fm/ )
rivendell : An automated system for acquisition, management, scheduling and playout of audio content. ( http://rivendellaudio.org/ )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a proaudio
For Paludis use this rsync : rsync://gentoo.zugaina.org/proaudio-portage
If you have a problem : ycarus(-at-)zugaina.org