I have a gaming forum with a lot of individual game forums. They are getting difficult to sort under one category only, as many of them fall across two or more genres, and also potentially two or more camera angles (isometric, first person, third person etc). My idea is to assign "tags" to forums, and have a checkbox for each "tag" at the top of the main forum list. The user can then select the checkboxes which would only show forums that match ALL of the users selections. By default, all checkboxes are selected so that all forums as displayed, however there should be a "Select All" and a "Clear All" option for efficiency.
I was hoping that there might be an existing modification to do this.
EDIT: The thread title says "categories", but it should be "forums".