Blogs are one to many discussion board if you comment on do follow high PR blog sites then really its worth.
Blog commenting is a tricky and probably risky business and in the heart of a good blog comment is a thoughtful response as atnibnerd said. I have a blog and I think that I would always leave them on page if they are: "clean" in the message, in the link they provide, and if in line with the post.
No doubt, Blog commenting is fastest way of making back link , Its good if you comment on relevant and dofollow blogs.
Yes blog commenting is very useful technique. Infect i just notice that after Panda updation bookmarking and blog commenting matters more than any other technique.
I use Comment Kahuna to help find relevant blogs. I like to leave a mix of dofollow and nofollow, so I don't really differentiate between the two when commenting. Just make sure to leave a relevant comment and not the typical "Good post!" or it will just be deleted and you just wasted your time.
Blog commenting is very useful for SEO. Specially do follow and high PR blogs will help you to get traffic and Page rank.
if you are posting comments from blogs that has a do follow attributes and the blog is related to your niche with a quality content then it is good in your seo efforts to put comments on those pages.
I'm doing this blog commenting every day. It's really good especially if you commented on high PR and DoFollow blogs.
yes.it is very good for getting backlink in SEO.Blog Commenting Is Good for getting backlinks.But if you have hired a person to do blog commenting then it is not good for you because hired persons do not do the same commenting which you have need. Rahul
Blog commenting is still good, as the search engines still love blogs, and it does take a lot shorter time than say article marketing