Good list. Some definitely good examples, if people really want to try. I think “interview other people and sell the interviews” will work the best. Or just build a website and post those interviews. I have managed a few websites where we interviewed people and those get a lot of visits from Google searches. For anyone out there willing to interview people I would recommend it, it will make you money.
This is something that is fairly easy to learn and also in high demand. On Windows, one good program to edit audio is Sony Sound Forge. I use Sound Forge Audio Studio, but if you are doing this professionally, you might consider the upgrade to Sound Forge 9. Get the hang of editing out “um”s and “ah”s from audio. Even better is understanding the “flow” of an interview conversation and editing out portions that don’t make sense. Finally, learning to find and add intro music really gives podcasts that professional touch. Advertise your services on oDesk or eLance. I pay people to do this for the podcasts I am setting up on Inspiring Innovators, and it’s a job that can definitely be done from your house.
Consider some other ways you could make money online or elsewhere. You could start a website, try your hand at creating videos or build your own products to sell on the Internet. Unfortunately, you're going to need a fair amount of expertise to make it in any of these areas, and if you don't have the know-how yet, you'll almost certainly need some intense training in Web design, editing or the like.
What does that mean for you? It means Nielsen will pay you $50 a year to keep their app on your favorite internet browsing device. The app itself collects statistics on your internet usage anonymously, so you never have to worry about any data being linked to you. And the best part is, the app takes up barely any space and doesn’t slow down your phone or tablet at all!