This one's really simple. If you have a video camera on your laptop or computer, just record a video of yourself discussing something that you're passionate about. Save that video, edit it a little if you so choose, and then post it to YouTube. Enable ads on that video. Over time, you'll earn a trickle of money from each video you post.
Just as with blogging, the real value comes from recording a lot of videos so that people who find you and are interested will stick around, watching more of your videos.
This is a great way to channel your thoughts into something that can earn a little bit of money, particularly if you're not strong at converting those thoughts into the written word. Video challenges an entirely different set of skills.