Not something that will get you banned by the search engines.
Not software or hardware.
Not difficult or complicated.
Not something that will require you to upgrade your computer, or your operating system.
Not expensive to learn or to implement, either in terms of time or of money.
The strategy is something that can work regardless of whether you intend to earn your income through affiliate marketing, merchandise sales, setting up AdSense sites, running eBay auctions, writing and distributing articles or press releases, or whatever other methods you use to market yourself or your sites.
The strategy could be used for offline income generation as easily as online (though my background and the examples contained in the report are all online projects).
In fact, the strategy is something so simple that you'll be frustrated that you didn't think of it yourself. Or maybe you did, and just didn't do anything about it!
There is very little fluff in 5 Bucks a Day, you'll be able to read it in a single sitting. It's short enough to encourage you to read it multiple times. Simple as the strategy is, there are some nuances that you'll want to make sure you don't miss, so multiple readings is recommended.