Google backlinks + PageRank + Class C IP
PR Weaver retrieves the text of the backlinks and gives you an analysis of the terms used in the link text (anchor text) and alt text (Alt Img text) pointing to your site. You can also filter internal backlinks (backlinks from the same domain or sub-domain)
PR Weaver can be extremely effective for searching competitor backlinks. As a SEO you probably know how it is important to get incoming links and quality anchor text from high PageRank pages in order to increase your Pagerank (your link popularity), and your search engine ranking. Having good backlinks is great for two reasons: For your search engine ranking and for the targetted traffic that the links themselves bring.