A mixture of things. From the top of my head: Folders of plain text files, mindmaps, paper Having said this, the actual challenge for me lies in deciding what

A mixture of things. From the top of my head: Folders of plain text files, mindmaps, paper Having said this, the actual challenge for me lies in deciding what notes are actually worth storing. I recently browsed through the hard drive of on old laptop and was astonished to find out how maybe 95% of the notes were completely pointless. I guess a good deal of notes are only important the moment you are writing them down (to make something clear to yourself). In other words, much could have been written directly into /dev/null.