Replace taxonomy links with discovered links

Continued from http://drupal.org/node/74489 :

Ideally, the weighting of a related link would involve all the following criteria in an appropriate user defined order:

* Taxonomy terms.. as mentioned in the first post.
* User ID.. nodes created by the same user are more likely to be related.
* Search index.. make use of the search module's (if enabled) indexing and scoring system.
* Node ID / date.. avoid stale data by preferring newer nodes.
* Node type..

-K