Today I rejoined The Harry Binswanger Letter (HBL). It's an Objectivist discussion forum. I left in the past because it was moderated and didn't allow me to say some things. It also limited how often you could post to something like 4 posts per week if I remember right. I also had some disagreements with Binswanger (e.g. he hated Popper from a position of ignorance). It's been changed to allow unlimited posting on a web forum and then he only emails selected posts out to the members.
You have to pay for HBL. I don't mind that, but I do mind the lack of public links. (If I ever make a paid forum, maybe I'll have people pay for posting but allow reading for free.)
What I'm going to try doing is reposting my own posts as comments below (unfortunately I'm going to lose the formatting sometimes). I want to have my own copies in case I unsubscribe, they lose their data in a computer crash, or they edit or delete some of my posts. (They actually pay someone to go through and edit formatting and typos. I don't know how far the editing goes.)
Update: I've been banned from HBL. Read my blog post explaining. In short, Binswanger dislikes critical discussion.