create a library-like interface for user data so that one could add, sort, filter, search user data
For example, take the library interface. If you kept all the user data in one database and created an interface similar to the library, one could sort, search, and filter to their obsessive hearts' content. And, like the info button, you could set it up so that once a particular note has been selected, a simple click of the mouse would make the data of that note is accessible to the right (or left for that matter). Something like this would hopefully be simple to setup using the library interface as a concept template and would be flexible enough to accomodate many different ideas of how notes should be used.