OK, I totally understand that there are many theories flying around the whole place about what type of backlinks is the best and what type has more weight than the other. One thing we know for a fact is that SEO is not ABC. Its not a yes or no answer. So this has lead many people to start creating their own theories all over the place about what is the best SEO methods and what SEO methods is not effective any more. Well I will shed a light on this now.
Article Marketing: This is still relevant and it is an easy way to get backlinks. Take a spinned version of your article and post them on the article directories. Put your backlinks at the resource box. You can use anchor text to tell Google what your site is all about. You can also decide not to use anchor text. A link is still a link. You cannot go wrong with article Marketing.
Contextual backlinks: I labeled this Contextual backlinks because the links will be placed in the article post itself not in the resource box. Now majority of article directories do not accept links in the post. Usually WordPress blogs accept this. Most of the web 2.0 like blogger, Livejournal, Huboages all accepts links in the post. I believe Articlebase also accept links in the post. This is one of the best types of links that you can get. As a matter of fact, Contextual backlinks is the best backlinks to shoot for.
Comments: leaving comments on blogs is another way to get backlinks back to your page. There are tools you can use to scrape high authority blogs to comments on. However, understand that the more comments that are on that page, the less authority your own links will be.
Forum Links: Forum links are still relevant. They are not the best by any means. As a matter of fact, if majority of your links are from forum, you might risk sandbox from Google. It all depends on how you use it.
Bookmarking and Syndication: OK I understand that there are recent buzz around about having your content syndicated from different users. We currently use some of these tools actually. Understand this though; SOCIAL BOOKMARKING IS THE LEAST FORM OF WAYS TO GENERATE BACKLINKS. We are talking about SEO here which is about ranking your website to the top of the pages on Google. I have strictly used bookmarking to rank for the keyword “Herbalife reviews” before. But it did not last even on the first page.
There are more other types of links like the EDU, GOV, YAHOO links that you can get and twill sky rocket your website. There are also way to structure the links in a way that will be as effective without risking Google wrath. This is clearly an advanced topic and well covered in trafficgraviator