I'm working on something like this ..
Metadata::DB It allows you to put meta on whatever, and generate a search form from the data contained.

Imagine you are generating metadata for files, and you have a field called 'color', if you have 10 colors, one of the search fields generated by Metadata::DB::Search::InterfaceHTML is a "color" dropdown search option with the possible values. If the values are more then x, the field is a search box.

This allows me to set up file archives for clients, but the info they want to put on files may be .. who knows. And I want the search form to match up with their data, and I don't want to step in and edit html to match it, it would be ridiculous.