starlust is the mailing list for all things Lush.
The list is generally very quiet, with maybe one or two posts a day, unless something exciting is going on. With the recent split of Lush, there may be more to talk about in the coming months; it all depends on what Miki and Emma do next.
If you want to buy, sell or trade Lush stuff, this is probably as good a place as any to do it, and if you have questions, there are enough knowledgeable people on the list who will help you out.