Following Threads

Is there someway I can subscribe to a thread without posting in it? I have a feeling the functionality is thee and I'm just overlooking it. I'd like to receive notifications about movement in the thread, or save the thread for future reference as it moves, but I don't have anything to add to the discussion right now. Is there a feature for that I'm missing somewhere?

Admittedly getting an update for every single post is probably redundant, but some sort of bookmarked threads setup would be really useful.