This is a great piece of work for references, lots of info on this, Answer sites have become less and less popular, but the you can really build your name on these sites such as forums, if you are consistent in answering questions frequently. Out of the points you have mentioned, I relay enjoy the "Guest Blogging" point, as this is a win win situation, not just putting out content on other websites, but also welcoming guest on my own site, giving readers a change and a different style of article, as everyone is unique in their own way. I'm actually posting an interview tomorrow with a well known name in the guest blogging. Whichever point one choices from above, consistency is the key, there is no point doing it once, but it should be done on frequently, and over time with patience you will start to see the rewards.
Hey, Matt! Thank you for your sharing, and I learned much from it, but I still have a question. We began to do SEO work for our site 2 years ago, and our organic traffic grew 5 times ( from 8K to 40K every day). But two years later, it is very difficult to get it grow more, even it drop to 3.2K every day. So can you give me any advice to make our site's traffic grow again? Thank you in advance!

The truth is that a major problem for search engines is to determine the original source of content that is available on multiple URLs. Therefore, if you are having the same content on http as well as https you will “confuse” the search engine which will punish you and you will suffer a traffic loss. This is why it’s highly important to use rel=canonical tags. What exactly is this?
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.

Beyond organic and direct traffic, you must understand the difference between all of your traffic sources and how traffic is classified. Most web analytics platforms, like Google Analytics, utilize an algorithm and flow chart based on the referring website or parameters set within the URL that determine the source of traffic. Here is a breakdown of all sources:
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