In terms of adding to your list, I also recommend careers in online marketing. Now, there are two types of careers. The first one, where you have to work out of an office, is not really making money purely online because it’s a job that requires an office presence (although an absolutely amazing one and one that may still make your list). However, another route is starting your own SEM agency. If you start your own agency, you can make a tremendous amount of money from the comfort of your own home if you work hard and are really good.
Webinars are quite possibly one of the most potent ways you can make an exorbitant amount of money online. Russell Brunson often says that if you do a webinar every single week for a year, you'll be a millionaire at the end of it. You'll need an audience to train and you'll need to know what you're talking about. Of course, this usually requires having a website and some semblance of an online presence.
eBay is the most popular global auction site around and is a great place to sell items you no longer want. If you are looking to earn some extra cash, start out by looking around your house for things you no longer want; list them on eBay and watch as customers bid on them. You can also purchase clearance sale items and thrift store finds and make a couple dollars profit by listing them as well. The key to selling on eBay is to do your research and find out what the hot items are.