Getting Things Done (GTD) is one of the most popular productivity methods and Evernote among the most popular note-taking tools for Lifehacker readers. The Secret Weapon merges these two into one system so you can achieve your goals.
More specifically, The Secret Weapon offers a GTD structure and workflow for your Evernote notebooks. The requirements for using TSW are installing Evernote on all your devices (obviously) and reading David Allen's Getting Things Done.
Reading The Secret Weapon Manifesto introduction page you'll get an overview of why this system exists -- like the video above -- but productivity-seeking Lifehackers may want to just jump to the Setting Up The Secret Weapon section, where you'll find details on the suggested notebooks to set up -- Cabinet, Action Pending, Completed -- and initial tags.
From there, the site will tell you how to process your to-dos and other power user productivity tips.
If you've been searching for a new productivity system or want to make better use of Evernote, give The Secret Weapon a try. Be sure to come back and let us know what you think.