When I first started downloading CC I was so serious and over-organized; I'd keep an excel document with every CC I downloaded, their thumbnail, download link, creator, etc. Needless to say, this took more time than actually playing the game and using the CC. Nowadays I use folders in the Mods folder. I create one for each creator I download content from, and within their folders, I have other folders for CAS (clothes, accessories, and so on), BUILD, complete set-folders if I download a whole set, etc.