Nothing too fancy, but something I didn't find in the plugin registry: The plugin creates a short list of all subcategories of the current category with a count of articles within them. It doesn't create a full tree but still provides some useful insight into the hierarchy of the articles.
It's harder to explain than to show. See the "Sub-Topics" section on the left hand side. Now, if you go to en/Apache/ you'll see all subcategories I've created below Apache together with an article count. It does no show "Ant/dotnet" since this would be a subcategory of "Ant".
The code is here.
path: /en/oss/blosxom | #
If you are reading this blog you are likely to be interested in Ant or Gump.
If so, take a look at the ApacheCon Europe 2005 Schedule with talks about Ant by Steve or Gump by Leo - they'll be worth a visit.
path: /en/Apache/ApacheCon | #