Blosxom is a pretty good bit of blog software but it's main weakness is the inability to place a story into several categories without duplicate postings. This plugin is an attempt to recify that.
Storyfilter maintains a list of keywords and allows stories to be selected according to keywords. The keywords associated with each story can be displayed and if the user clicks on one, blosxom will display only those stories which contain that keyword.

Download the plugin (version 0.16). Full instructions are included in the zip file.

The plugin is still in it's early stages of development and should be considered a very early beta. At the moment, when a keyword is selected, blosxom will only display stories which have been viewed since the plugin was installed. This is because as stories are viewed, the keywords are be added to a list. I hope to rectify this in a later version.