Hey James, I LOLed at your comment. In a good way of course. What do you mean you knew about 3 things!? You better get to work then. Just kiddin'. Glad you liked the list and hope you will put it to use. And if you do, I really hope to hear some feedback on how it worked for you. These tips are awesome for websites like those, I have some of those. You should definitely give this list a go, I first tested all these on my main niche site and then on my blog. I can tell you that these sources can make miracles if they are used right.
On the basis of this article alone, you should be given a Ph.D in internet traffic generation. Absolutely fantastic set of ideas & sources for traffic generation. I had taken a print of this article the first I read it and then took some serious action of some of the ideas that have mentioned here - flickr images, blog commenting, slideshare (this even resulted in some great business leads and closures), sites such as blog engage, blog interact, social media sources such as LinkedIn, forum participation etc. And they have done wonders to my sites. The fact that there are 319 comments here even as I write is testimony to the authenticity of the ideas presented here. Great article which will one day be a classic - if it is not already.
The term “organic traffic” is used for referring to the visitors that land on your website as a result of unpaid (“organic”) search results. Organic traffic is the opposite of paid traffic, which defines the visits generated by paid ads. Visitors who are considered organic find your website after using a search engine like Google or Bing, so they are not “referred” by any other website.