Thinking of going the online course route? Then you might want to check out CoursePress. This plugin is easy to set up and allows you to create a full online course that site visitors can sign up for, complete assignments, take quizzes, and more. You have the option to create text, audio, or video-based courses, integrate discussion boards, and even offer video previews to entice potential students.
The holy grail indeed. The best idea I know of to recieve an as close to as possible passive income (on the net anyway) is to train affiliate marketers. Several affiliate programs have two tier payment systems so in thoery if you can train 20-30 successful affiliate marketers who sign up under your name you can get a passive income off thier hard work. But you still may need to educate and motivate them to continue to work hard. – Adam
“Let me remind you again that when you put a book out there, you are a published author in a space where you are an expert. Your book becomes the ultimate business card, not to mention a source of ongoing revenue. Did someone say “ongoing revenue?”. Who does not need to make some extra money on a regular basis? Realize that this book will take some work to complete once, but thereafter it exists forever – working to bring you royalty checks five, ten, twenty years from now. Money will be consistently flowing into your bank account. If you write a good book that provides real value, then you realistically have a revenue stream which will bring income for decades to come.”