So, from a post from one of the UI/Lua devs in beta on the LOTRO forums stated that scripts should be able to start being posted on 3rd party sites next week for the head start.
It'd be great to start working with authors to get some stuff posted over here for the launch.
Turbine also just added a new Lua forum in the general (non-beta) forums:
http://forums.lotro.com/forumdisplay.php?f=520