#D7CX: I pledge that Related Block will have a full Drupal 7 release very soon.
* Display "related" content by searching for nodes with many of the same words
* Per-content type related content display
* Filter related content results by configured content types
* Basic i18n support (respects content selection mode)
This does a search for nodes that are closely related to the title and content of the current node. It provides for display only on specific (admin-configured) node types.
Words in the title are given a slightly heavier weight than those in the content. Highly used words are stripped (currently only for English), and ignores words under 3 characters.
Note: This module relies on the search index being fully populated, which typically requires a working cron job setup to function properly.