I'm not sure if anyone else is having troubles with this but when I follow a discussion, nothing happens. If I want an update on the discussion, I have to manually go in a find it. I would expect an email or other means of notification.
Wouldn't it be convenient if there was either a) a box on the "Discussion" page with "Discussions I Follow" or b) the updates would appear in my stream? I dislike email notifications for discussion updates, because they clutter my inbox, especially when I follow many topics or many people contribute.