DoFellow 

DoFellow finds Dofollow blogs for specific keywords in an instant. It also shows you the pagerank for the website and with a click of a button you find hundreds of Do-Follow Blogs that are relevant to your topic.

All you have to do is tell DoFellow what is the subject of your website, and it will find you blogs in which you will write comments with 10-20 words and a link to your website.