Directory Submission
Directory submission is simply filling of your websites detail in online web directory. Online directory submission is a process which includes identification of proper category and filing the website or webpage detail in particular related category and get it approved by directory editor. It is not merely a data entry process it involve the decision of choosing a proper category which can be carried only by intelligent directory submitter.
Social bookmarking
Social bookmarking is a great technique to get qulaity backlink by storing online so you can access them from any computer as well as share them with others
Blog Commenting
Get a backlink through blog commenting is not bad. But you should be putting a backlink on the related blogs only.It's not just the back links, it's the reputation. You should become a member of relevant website communities.
Forum Posting
It is just another way of building links to your site. ozadin and Rube already told that you can add your link to your signature. You can also try to place a link within your posts if it's relevant to the topic you are replying.
Classifieds Submission
Much like newspaper classifieds, Classified submission is really very significant for webmasters as it serves different purposes. With the help of classified submission service, you can show your necessity to the outside world. It helps in marketing your product or service. It also very significant as an SEO tool that helps in popularizing a sites.
Article Submission
Article submission is one of the most oldest link building technique in seo.An article submission is the process of creating a blog post and then sending it to an article directory website.
Press releases submission
Press release is all about the writing about the latest news about your service through which people gets aware about what is new in your service and in the SEO point of view it helps in link building.
Search Engine Submission
Search engine submission is an effective tool of web promotion. It refers to the direct submission of a website to a search engine.
RSS feed submission
By submitting an RSS feed to different directories, you provide another way for your blog content to get syndicated and to distribute your backlinks