The Technical Editing SIG maintains a discussion list (stctesig-l). You do not have to be a member of STC or the Technical Editing SIG to subscribe to the discussion list. But, if you're interested in editing topics, we hope you consider joining STC and the SIG!
We also provide a read-only mirror of the discussion list in the forums area.
See http://www.stc-techedit.org/Discussion+List for details.