I still can’t get over how easy it is to profit from Google’s Adsense program. It’s quite possibly the easiest way I’ve ever made passive income.  All you really need to start is a blog or website, a general theme (helpful, but it’s not totally necessary to have one strict topic), and ads, and you are good to go!

I slapped Adsense on a couple of my sites several months ago, and those ads, without ANY additional work on my part, bring me in a couple hundred dollars monthly right now.  I know it could be a lot more if I had the time to update the sites/blogs with fresh content, submit them to more directories, gain more backlinks, etc.

In 2008, I plan on adding Adsense to all of my upcoming sites. I won’t totally rely on Adsense for my main income (it’s good to spread your income streams out rather than to focus on just one in case something happens to it), but I would like Adsense to account for at least 20% of my online earnings.