Commenting on blog posts on do follow blogs is a good way to build backlinks. I am going to give you a tip to help you get a bit more link juice out of that comment link. First find a blog post worth commenting on, then leave a comment that will help add value to the post. Next go to you your favorite do follow bookmark sites and bookmark the blog post link. I also like to add the comment link to top non dofollow bookmark sites, this won't give you a backlink, but will increase traffic to the blog post where your comment is listed. More backlinks and traffic to the blog post will help increase its Google ranking. You can use a tool like Only Wire to bookmark multiple sites. I like to manually bookmark the top bookmak sites like StumbleUpon and Digg.
I also like to tweet about the blog post and provide a link to my bookmark site such as StumbleUpon, Digg and other popular bookmarking sites. This will help build your social following. Plus you are also providing good content for your twitter followers.
John's Social Marketing Tips Click Here
My Facebook Fan Page