I recently found Comment Kahuna for help finding blogs on the same or similar topic as mine and help with posting comments in reply to their posts. This is NOT for spamming comments! Those will just get deleted since most bloggers are smart enough to moderate comments. You should actually read the post and post a genuine reply if you use it. It tells you the PR rank of each blog, whether the blog is set to help with page rank for comments, autofills the fields, and oh yeah it is free! Testing it out right now for my blog but certainly interesting. http://www.commentkahuna.com/ I have had people visit my site from a comment I left before. The comment form lets you enter your web address which will usually be linked.