If you love to travel and find yourself randomly searching for airfare sales or browsing Lonely Planet, why not carve out a niche for yourself as a private travel agent? My friend, Mark Jackson did just that, making extra money online with his travel consulting side business. Start with word of mouth recommendations from friends who know they can count on you for the cheapest flights, and then move on and create a Facebook or LinkedIn group to invite people who want to stay on top of the latest deals. Eventually you could spin this into a full-time consultancy teaching people how to make their dream trip a reality.
Outsourcing is the new and dominant wave of the business world. As businesses shed employees, they increasingly turn to independent contractors to supply what in-house staff used to do. One of the ways they do this is through virtual assistants. These are people who provide certain tasks online. Businesses can use virtual assistants as much or as little as they need to. If you can make yourself available to multiple businesses, you might have plenty of work without ever leaving your house.
If you have a propensity for writing and you can slay with your prose, consider writing an ebook. While the market has certainly become saturated as of late, books that help teach people about a technical topic still sell extremely well. This is a great source of passive income but does require a large amount of effort at the outset before any money is generated.
Before having my own website, I spent time reading websites, newsgroups, bulletin boards and forums about the game, and eventually started trading online. Back before search engines were any good most of my time was spent in particular Magic newsgroups, some that talked strategy, and some that were focused specifically on trading and/or buying and selling cards.