I am using ever note as a text database for random stuff. e.g. I might have an entries like Sink - needs a new r345 nozzle girlfriend - take to the beach when it's sunny and .... etc. I love how in evernote you can add tags to each entry, but the one BIG FEATURE that I'm missing is that in addition to this I would like to have categories and subcategories (e.g. a hierarchy) for the notes. So while I like the tags to search for the information I want, I would also like to be able to use categories as well to browse the information. E.g. under the category 'girlfriend' I cannot subcategories such as "special dates" , "working on" , etc. Any ideas if an app like this exists?