I run a website that contains the text of a large number of public domain books on a specialist niche topic, spread over a large number of HTML pages.
I also have a fairly enthusiastic website audience that read the books regularly.
Sometimes there are topics on pages in some of the books that relate to topics on pages in other books. But I don't have the time or resources to manually go through every book and create HTML links for similar topics.
Does anyone know of any third-party web software that I could use to allow my website visitors to "tag" similar topics across different web pages, which might then be linked automatically via a tag cloud?
I would like the approach to be as hands-off as possible with me only having to get involved to clear up any tag vandalism or mistagging.
I already provide a Google custom search for the site which, to some extent, already enables users to find related material but I am looking for a human-based tagging/tag cloud approach that will supplement this.