The first thing I added was Advanced XFire Field you can now put in xfire in your profile and see it in posts.
The second thing I added was Ip to Country 1.2 to 1.3 for admins only, now when you click an IP it will show the country of origin without having to whois it, Doesn't work 100% of the time though.
The third thing I added was VisualWarning which admins can punish posters for being idiots, like stopping them from doing stuff or disable them from posting at all. Look at the post below, which is an example of what it can do.