If you look to the right when posting a topic you will see some awesome smilies. But did you know that clicking the + next to the work Smilies opens up a bunch more? There are 1000+ smilies you can use on this board.
If you haven't earned one yet. Eventually you will. You get rewarded with badges for achievements. The first one everyone will most likely get is the avatar award. For uploading a custom avatar.
If you are lets say having a conversation with one person and want to bring a third person into the conversation. You can @mention them in a post and it'll notify them about it. Just start with @ and then follow it with that persons name. You even get a cool little box that will help you cheat too.
So far those are all the extra features we have. As time goes on I will add more. If you have any requests just let me know.