From Henry Zeng:
Identifies Wordpress blogs with the 'nofollow' tag in the comments field in any niche you choose. Saves you time and effort from searching for blogs manually to leave comments on and building backlinks. Shows you the Page Rank of each of the individual blog posts itself and home page of the blogs. Displays the Alexa ranking of each blog (so you know what's the amount of traffic the blog receives). Tells you if you have left a comment previously on the blog so you can track your link building efforts with much ease. Allows you to save your findings and results for more effective tracking/analysis in the future.