This is a truly great idea. I think there should be a movement to explicitly rank and grade tutorials.<p>I wonder if there is a good way to create a hub for this sort of thing.<p>A HN interface would not work because<p>(1) you want many different rankings for different subjects (so maybe more like reddit), and<p>(2) tutorials and guides have expiration dates.<p>What is a good way to deal with both of those?