I made Logos because I needed a simple program that could store any kind of information I wanted: lists, quotes, ideas, notes, links etc. The environment I've created for all this content is nothing too complex: a simple text editor and a categorization engine. However, even as little as this can be handy. You can have entries for something as small as a passport number or as long as a diary entry.
The purpose is to be able to access all your information and ideas very quickly. No more text documents forgotten around in hard drive folders, notes filling up the desk and many corners of the room, scribbled text through books and notebooks, sent to myself through email etc. The idea is: give each piece of content a title and put it in its right place.
Here is how Logos is particularly useful to me: