(just a quick note.)
Existant data-object storage and retrieval systems:
- Hard hierarchialization ("taxonomies", "categories with parent/child relationships")
- Analytico-synthetic ("Faceted categorization", "Semantic Web")
- Unstructured labelization ("Tags", "Labels")
- Statistical extrapolation ("Keywords")
- Unstructured data ("Full text search") [Disclaimer: not taking into account grammar and vocabulary within, i.e. a paragraph of intelligible english text. See the nightmare that is natural language processing.]
Find a UI metaphor that incorporates all in an intuitive, easy to use way.
(Title refers to a natural cycle that all things go though. Birth and death. Development and decay. Information is no exception.)