This looks really neat and powerful. I think spreadsheets have a lot of deficiencies and that many users abuse them, but that's because there is no widely known alternative/extension. For example, I wanted to create a list of data sources in a particular area. It doesn't warrant any coding, this is just a simple document, but doing it in a spreadsheet is too clunky: I want tags, paragraphs of text, and, crucially, a vertical "heading-tags-link-description" structure. In the end, I wrote a Markdown doc, but now I can't sort or filter! It looks like UltOrg could deal with this, even though it's probably not one of the main usecases. I wish Eirik the best of luck with the project.
Using Org mode [1] and for example EasyOrg [2] does pretty much that. You can use tags, links etc and filter and sort on text and tags. In the case of EasyOrg you would use the Agenda's List view and for the paragraphs to show up in the Agenda they have to start with TODO (or a custom state, i.e. '* DATA My link number one'). The document preview does not support filtering.
