Note: As of 2009/07/24, this module appears to no longer be supported. If you are interested in a module with similar functionalities, you can check Advanced Blog; if you as the module maintainer feel this message has been posted in error, please reply to #432248: Blog Add-ons, Blog Information, and Blogger seem abandoned.
Blog Add-ons module adds some useful features to core blog module. It deals only with an existing content (no modification of db) so it can be easily installed and uninstall without affecting Drupal.
This module provides a way to find similar nodes by taxonomy using views.
Features:
Weighting by vocabulary - Say you have two vocabularies on a movie site "Genre" and "Community Tags", the latter being a free tagging taxonomy. With this module, you can give Genre a weight of 10 and Community tags a weight of 1. Which means that if I'm looking at "Meet the Parents", I'm most likely to see a list of similar Romantic Comedies like "Sleepless in Seattle" and "French Kiss" with something like "Taxi" or "The Godfather II" coming lower in the list, because someone tagged both "Robert De niro"
Sorting - Sorts by weight... pretty simple
Filtering - I want to see only those with a weight higher than 15... this is a little arbitrary, and you are better off using the pager / limiting results, but it does work - Actually, doesn't. I tried to hack around views not letting me mess with the count query, but just couldn't get a HAVING in there... Oh well.
Usage:
Install the module (duh)
Go to admin/settings/similarnodes
Set the weight for each taxonomy
Now create a view, add the argument "SimilarNodes: Source Node Id" - You need this to make it work