For our client: We only used a smaller quantity of very high-quality link building each month. So, for example we only built 40 of the best links each month to supplement the work we were doing on the content marketing front. We also invested heavily into tracking competitor backlink profiles, using Majestic SEO and Open Site Explorer. We worked out how the competitor's acquired specific backlinks, then by using outreach and content creation we obtained these links.
I just joined digg a few minutes ago. I gotta tell you that I have been researching on this topic for several months now. By far the best article I have come across on traffic generation. It's one of the most comprehensive ones I've read. And includes a variety of sources which never struck me before. I'm a musician and I plan on starting a blog and uploading videos soon. This is really going to help me a lot and I'm gonna follow. :) I really like the idea of using sites like wiki, about.com, scribd etc...
Before developing this subject further, indulge me to remind you that according to Google a robots.txt file is a file at the root of your site that indicates those parts of your site you don’t want accessed by search engine crawlers. And although there is plenty of documentation on this subject, there are still many ways you can suffer an organic search traffic drop. Below we are going to list two common yet critical mistakes when it comes to robots.txt. 
Another special mention is Quora. The question and answer site is like a high class, actually-useful version of the defunct Yahoo Answers. Experts find questions in their industry to answer and provide detailed answers, either in the form of a moderately lengthy post, or in a post that links out to their websites. You, too, can take advantage of industry questions by answering them the best you can. Users can vote on the most useful answer, and it floats to the top, so the more useful you can be, the more exposure your link will get.
The top five leaders in paid traffic (Google Adwords) are the same companies that lead in search, with Amazon again on top. Leading retailers don’t want to put all their eggs in one basket, and they are willing to invest heavily in pay-per-click campaigns. Clearly, PPC has worked for them because we see four out of the top five spenders are the leaders in annual sales numbers.
There’s also other search engines. Ask, Dogpile, IxQuick, and so forth; these are all minor. However, one search engine seems to be gaining market share and exposure, and that’s DuckDuckGo. It has been trending in the wake of Google privacy concerns and some clever marketing from the DDG staff. It’s something you should, at least, pay some attention to.
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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