Taxonomy

Relevant Content

This module provides blocks [that] give the user a list of nodes which it considers most relevant based on the current page [...] by finding other nodes which are of the same type and have the most similar terms associated.

Hasn't been updated in a while, but if the author is still interested it would be an excellent one to integrate with Related Content, as it looks like he is thorough and thoughtful. Unless someone requests, though, there are no plans at this time.

Similar by Terms

By jjeff, in use by Lullabot.

This Drupal module attempts to provide context for content items by displaying a block with links to other similar content. Similarity is based on the taxonomy terms assigned to content. Blocks are available based on similarity within each of the defined vocabularies for a site as well as a block for similarity within all vocabularies.

http://drupal.org/project/similarterms

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