Studioware mailing list
http://slackermedia.info Slackermedia is documentation providing the information a user will need to create a full multimedia studio from a Slackware base install.
http://opensourcemusician.com The podcast covers the use of free libre and open source software for musicians. The show covers topics like software, gear, audio releases and recording. Also, see #opensourcemusicians on irc.freenode.net.
http://slackware.com The homepage for Slackware Linux.
http://slackbuilds.org A large repo of slackbuild scripts.