I come across a good bit of software recently called “comment kahuna”. What makes it a really good piece of software is that its free. You can download it at http://www.portalfeeder.com/commentkahuna.php

The software allows you to search for specific keywords in blogs that allow comments. Its also lists the PageRank of the blogs it has found. Its ideal for very low cost backlinks and PageRank building.

The key to the software is the filtering aspect. Comment Kahuna filters ALL blogs that does NOT use the “nofollow” tag. Adding comments to authority sites does increase your overall PageRank and of course your general traffic as it takes advantage of high authority and high niche blogs. Be careful not to spam as blog owners see that as a pet hate and will ban your ip or tie their site down. How many times have you seen ” nice site and good post” in a comments response. Take your time reading the original post and make your comments clear and to the point, the blog owner will like you for it.