It’s a stable-beta plugin, but based on LJ-XP. It’s made to allow cross-posting to multiple LJ-compatible services, which LJ-XP doesn’t allow.
Have entered details for both LJ and DreamWidth. Testing now.
EDIT #1: Okay, it seems to work. Just tweaked a couple of settings and that should be ok.
EDIT #2: And turned off Dreamwidth’s automatic cross-posting, to stop my LJ getting spammed with multiple copies.