Participate in forums Seo

Just go to google and enter your [major keyword + fourm] or [keyword+groups] and search. Suppose, your blog is about blogging, then search 'Blogging forum'. You will find some forums, groups related to your site. Register in the forums and post articles, etc with a link back to your blog(as a signature). Answer questions, clarify doubts and provide a link to your blog. But, Dont' SPAM.