Google Chrome has over one billion users. More than 70 million users have at least one extension installed. That is massive traffic right at your fingertips.
Did you know you can deliver almost any content inside a Chrome extension? Video courses, sales pages, you can connect applications. Even somebody else's stuff. And when someone installs your extension you can collect their email address giving you laser-targeted leads.
Google is also it's own biggest fan, so you can imagine how well these extensions rank in the search engine.
How about digging your harddisk for unused PLR? Turn it into a free training course and deliver through your own extension. Give users a free version and make premium content available as an in-app purchase. This is what Curtis did with his SSL course. He has hardly done any promotion but after one week of installing he had 75 premium users out of 89 total. Not bad. You can check it out through the sales page.