I found this to be a fascinating and most helpful book. It was so motivating I'm already working on three new streams of income, and about to start a fourth. Forget net worth! Cash flow is much more important, particularly if you're retired. Only one slight criticism of the book. It's a bit dated, but those few parts make little difference to its overall value. If you're currently struggling with how you're going to survive after you retire, try Allen's approach. It will open your eyes.
The craziest part of this was I’d wake up in the morning and there would be more money in my bank account, from people who had bought my book overnight. When you think about it, an online store that sells something that’s digital is something that’s open 24 hours a day, 7 days a week, 365 days a year. Using tools, software and systems, you can automate the delivery process so you literally don’t have to do anything to serve that audience. That’s super powerful.

Income from the performance of services directly related to the use of a vessel or aircraft is treated as derived entirely from sources in the United States if the use begins and ends in the United States. This income is subject to nonresident alien withholding if it is not effectively connected with a U.S. trade or business. If the use of a vessel or aircraft either begins or ends in the United States, refer to Transportation Income in Publication 515, Withholding of Tax on Nonresident Aliens and Foreign Entities.

DonebyForty Yes, that makes total sense! I hear you on the savings rate, too. I always figured I lived lean enough (and had enough saved up) that I could handle things even without my main source of income. However, after leaving my job last year and having a tough time with freelancing, I realized not having a job was more of a mental drain than a money one. I like knowing I have control and can call on another source of income and increase it when I need to. 
Investing in real estate: Investing in real estate offers more passive income cash potential - but more risk - than investing in stocks or bonds. You'll need substantial amounts of cash to invest in buying a home -- it usually takes 20% down to land a good home mortgage loan. But history shows that home prices usually rise over time, so buying home a for $200,000 and selling it for $250,000 over a five-year time period, for example, is a reasonable expectation when investing in real estate.
Amazing article Jim. Jammed packed with great information and inspiration for a finance blogger looking to find ways to diversify income streams. Building up your capital, achieved through saving more than you earn as you described, will open doors to a lot of activities in the future. The name of the game is putting your savings to work to turn expenses and idle cash into income producing assets. It isn’t easy when you are starting from $0, but through discipline and time you will eventually be able to achieve your goals and begin using the methods you described to diversify your income streams.
Awesome article…if this does not give somebody a clear roadmap, they probably were never going to get there in the first place! I’m kind of like you trying to figure out where to place “new” money and maturing CD’s in this low interest environment. Rates have to go up eventually…I dream of the days again where you can build a laddered bond portfolio paying 8%. I plan for a 5.5% blended rate of return, with big downside protection.
Wow! What an awesome list! My favorite is the stock photography because I love photography. I have had some success there, particularly with one photo I make some decent income from. I think the key with stock photography is finding a shot that is high demand. Then, find a new unique way to frame that shot. This is the reason my St. Louis Arch photo is a top 10 on both ShutterStock and iStockPhoto. Thanks for the awesome ideas above!
The book is not bad but it's not that great either. Think of it as an idea book in which you see him mention something and then research it futher. The rambling just becomes too much as you move along to the point where it becomes annoying to read. The tone the author uses is very nonchalant and he doesn't really explain anything. Ideas are just thrown out.
With websites like Ebay and OLX, you can now sell virtually anything on internet to those who are looking for products. So you can do some handicraft or anything else, which can be created at home in extra time and then it can be sold on ebay. Or you can find some local product which others would find awesome, but its not available in other parts of country and then start selling it online for a profit. Even you can look at some products which are selling at huge discount at stores (wholesale market or under clearance sale) and then sell it on amazon at regular price.
Audiobooks are witnessing a surge in popularity when compared to their text-based counterparts. If you have decided to write and publish an eBook, converting it into an audiobook requires little effort and is a great way to bolster your income. Amazon's Audible ACX platform connects authors with producers who can turn their written work into professional grade audio. Once that's done, the audiobooks are put up for sale on Audible and iTunes.

"But for our jobs, for how we make money, I think many of us — most of us — have one way we make money. It can be very risky. I've really come to believe, and have done a lot of research over the years, that one of the best ways that we can create real, legitimate professional stability for ourselves is by choosing to cultivate multiple income streams.
If you are a photographer looking to diversify your income stream, putting together styled stock photo packages can be lucrative. For example, a package of 15 wedding-themed stock photos for $10. You can then market this to any bloggers or businesses who are in the wedding business for their use (photos of different engagement rings styles are super popular). Through this method, it’s possible to make a continuous stream of income off of photos you’ve taken once (similar to a licensing deal).

The engineering industry of India includes its growing car, motorcycle and scooters industry, and productivity machinery such as tractors. India manufactured and assembled about 18 million passenger and utility vehicles in 2011, of which 2.3 million were exported.[179] India is the largest producer and the largest market for tractors, accounting for 29% of global tractor production in 2013.[179][180] India is the 12th-largest producer and 7th-largest consumer of machine tools.[179]
Earning sources include books, courses, merchandise, coaching, freelancing, speaking, training, selling advertising, and affiliate marketing. For example, a virtual assistant can create tangible or digital products, such as books, courses, and videos that teach others how to be a virtual assistant in the “products” spoke. For services, she can offer additional services, coaching or speaking (i.e., How a Virtual Assistant Can Save Businesses Time and Money). Under other, she can expand her business by bringing on contract virtual assistants and become a manager of a VA company. Not all businesses will be able to come up with ideas for each spoke, but every business should be able to develop extra income streams from their home business idea.
It’s outdated as far as referencing information contained within. It’s just detailed enough to make you feel like your getting some good information but in reality since the links don’t work your really getting nothing except some information that you then have to find detailed answers elsewhere, to bad they turned off their website with that supposed information. I also emailed the company for links for these detailed answers that they left me wondering and they never replied. I would pass on this book unless you want to get a general idea of some things to look at doing but they are not worth the read since they failed to uphold their website that had more information.
There are a ton of ways to diversify your investments, some of which can send real income your way. By opening a brokerage account and investing in ETFs or mutual funds, you can earn real returns you can use to supplement your income. Of course, the flip side can also happen – as in, you can lose money. So, make sure you understand the risks before you dive in.