Yes! something like a table of contents?

The Tag Cloud is a good way to start, but once you generate 10 posts a day for too long, the tag cloud is no longer a useful navigation tool

Something like this maybe: <http://drupal.org/project/hypergraph>

Drupal can also automatically generate "related content" based on whatever criteria you define as important or manually entered links. Adding more and more blocks to the page might not be good for efficiency, but providing more diverse paths to explore the content on these sites would be great.

In the long run, the more crosslinking there is, the easier it will be to visualize the stronger nodes and the easier it will become to find highly cited posts. At this point, good posts get even more citation. Good navigation is the critical first step.

I spend a lot of time these days fishing through older posts on Overcoming Bias, looking for something to read, but it is definitely not set up as a repository of knowledge.