Related Pages
Related Pages are linked to the page you're on by recent click traffic.
In other words, these are an additional form of links between pages, left by users as they move about.
In the Related Pages section at the bottom of each page, font size shows the amount of connecting traffic and colour shows the time since last edit. Red=new, blue=old. This way, you can see what's happening local to the page you're on - important tacit knowledge.
As people (in this case, registered users) click about looking at things (either through the Related Pages section or any other way), connections are a made or strengthened, old unvisited ones are lost, and wiki pages can spread about finding useful places to come to life.
This produces far more efficient mixing than relying on fixed links in pages, users sending them to their friends, teachers telling students to go and have a look at something etc.
It also produces an efficient feedback between users and content, and between users, with the capacity to learn.
