Web/Mac: When Sid Yadav realised he didn't need lots of text files and Evernote documents, he created 5iler, a new free app for web and Mac that gives you only five notepads for all your digital scribbles. The idea of the minimalist notepad is to keep things maintainable by not giving you too many options.
The five "files" are persistent and auto-save your data. You can customise the colours and labels to fit your needs. Only one of the files is open at any time, and the width adjusts itself to any screen size. Keyboard shortcuts let you open any file with the 1-5 number keys and switch between them by keeping Alt pressed while hitting those numbers.
The system surprisingly works. I found that five notepad files was exactly what I needed to reduce clutter while maintaining productivity. I've set the five files to have a procrastination pad, to-do list, "don't delete", "scribbles" and clipboard.
5iler uses your browser's local storage, so clearing cache will lose all your data. You don't need to worry about this if you use the Mac app. Yadav says he is working on a cloud-based sync system, probably with Dropbox or Google Drive.
Don't mock the five-file system before giving it a try; you never know which productivity trick is right for you. It turns out this worked for me better than I thought it would.