HBL, The Harry Binswanger List http://www.hblist.com/
An email list for Objectivists for discussing philosophic and cultural issues, moderated by Dr. Binswanger, a long-time associate of Ayn Rand and editor The Ayn Rand Lexicon.
Objectivism Online http://www.objectivismonline.net/
A student-run online community created to bring together Objectivist ideas, commentary on current events, essays written by intellectuals, discussion with Objectivists and other Objectivist websites.
Chats and Forums