Great list! Another suggestion would be transcribing. Transcribing really requires very little skill or capital to get started. You can sign up with companies like Elance and Odesk to find jobs OR reach straight out to producers of audio content to see if they need help. With the huge trend in podcasting a great place to start would be by perusing iTunes for podcast shows that may need help turning their audio podcast episodes into text for their website or “show notes.”

If you are in the US, look into choosing a career as a drug representative. I have heard that pharmaceutical sales representatives for major drug companies can make a lot of money especially if they are very pretty. Now if you are very pretty and need money tomorrow this won't work. But if you are looking for a satisfying career with the potential to make very good money and use your "pretty" factor becoming a pharmaceutical sales rep may right for you.
 iWriter – iWriter is an old site which pays up to $15 for each accepted post. That may seem small, but they aren’t as strict as many of the others above, they are also recognised by many sites and are well known and famous. The thing i like about them is that they also allow you to pick exactly what you write. You can write as many or as few articles as you want. They will also assign you a category of writers and people can self choose you for their writing needs.
Ian Daniel, a businessman from Wigan, signed up for a range of home-study internet marketing courses to boost his fledgling e-commerce business. "The information came thick and fast," Mr Daniel said. The issues covered included "search engine optimisation" - making your site appear high up on search results - as well as online traffic generation and advice on "affiliate marketing".
But don't make the mistake of thinking this will be a passive source of income—you're on call whenever you have a guest and you'll always need to keep the place clean for incoming visitors. On top of just renting on Airbnb, consider offering your guests paid add-ons, like Lauren Gheysens', Royal Day Out in London, England—where she gives visitors a local's only tour of the city, complete with bespoke 18th century costumes.
If you seriously want to make money online, you need passive income. You need your income to come automatically so that you can use the precious little time you have to produce more streams of income that will pay you on autopilot. That’s the holy grail of income-producing activities. Now, it’s not easy to do, so I’m not going to sit here and try to insult your intellgience. It takes an enormous amount of effort and very little financial gains at the outset.

Going into network marketing? Understand that if you're not close to the top of the food chain there, your ability to generate any serious amount of income will be limited. Be wary of the hype and the sales pitches that get you thinking that it's going to work the other way. Simply understand that you're going to have to work hard no matter what you pick to do. Email marketing? Sure. You can do that. But you'll need a massive and very targeted list to make any dent.
If you want to clear some space out in your house and have a big stack of books you’ve been holding onto for too long, you can make money selling your books and textbooks online. Stores like Half Priced Books and others will give you cents on the dollar for each of your current books while you can check what your book is worth by simply entering the ISBN number on Book Scouter.
Fiverr: Israeli-based Fivver was started in 2010 by Shal Wininger and Micha Kaufam. It's a great resource for selling just about any service online. You can offer gigs as low as $5 but also get paid much more for upgrades and add-ons. There are plenty of providers earning 6 figures on Fiverr so it's definitely a worthwhile cause for generating a healthy income. Just ensure that you provide some serious value. 
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