It seems that one thing that’s really needed is a taxonomy/vocabulary system that works like tags (multiple “tags” per item, auto-complete, “add new” in-place, edit all from central location, etc.), along with the metadata of Collections – so that each vocabulary item also has it’s own “page” with Dublin Core fields and files, etc., like how Collections are. “Tags” are good, but they can’t easily be limited to relevant fields, and they don’t have their own metadata.
For example, I have a bunch of “Book” items and I want my “Authors” element to allow me to easily assign an author for whom I’ve already entered several books that she’s written – so it would be nice to have her name show up as an auto-suggest in the Author element field. This particular book has multiple authors, so this can’t be solved with Collections, much less since the book already belongs to the “Modern Fiction” Collection. My next book Item is by a new author, and it would be nice if, like with “Tags,” I can simply enter the new author and have the auto-suggest stop showing suggestions once it’s clear that it’s a new entry. Tags are not good here, because I want to link to the Author’s page, with it’s own meta-data and list of Items belonging to it (as if it was a Collection).
Make sense? Is there currently development going on for this? After working with Omeka for a while this seems like a glaring omission.