You can now add users to your buddy / ignore lists. View their profile and the links are at the bottom left. Right now if they're on your ignore list, their posts simply are hidden in topics. In the future, they won't be able to PM you either. The buddy list does nothing currently. You can't ignore mods or yourself

Why should I ignore people? Everyone here is an interesting person. I would like to ignore threads, though, so that they don't mark sections as "having unread posts" if these posts are in threads I ignore.