Let me give some tips regarding blog commenting: 1. Post the comments in high PR blog sites that helps to increase your traffic. 2. From SEO point of view, it is better to comment on dofollow rather than nofollow for effective backlinks.
External factors do have a major effect to your SEO campaign. according to SEOmoz, incoming links is the "winner" of the most powerful things you can do to increase your rankings. Blog commenting is ONE way to do this - but beware of "link spam" dangers associated with this. My best tip is to try the "Fast Blog Finder" software that help you detect high page rank internal pages on high page rank domains in your niche - which increases the link value and also will increase the chances of attracting REAL users from your links as well!
Regarding your question of where to find blogs to comment upon, you can use comment kahuna or dofollow diver to find blogs that have the dofollow attribute set on.
blog commenting help you out once you find similar blogs of your business area and then you post related comment.
some blogs directly ask your website address, give url there and name field give your keyword you want to promote. and in some blogs you need to write html coding along your targeted keyword in comment
All of these things should be known to even the newest person to commenting on blogs or SEO itself. Posting on Do-Follow blogs are better then No-Follow blogs, but every comment counts.
Blog commenting is a natural opinion you want to express on what the blogger write about. In short your comment..
it's very easy, just open blog which is related to your website concept and then post comment after read entire blog and analysis it.
From a blogger's standpoint, if a person's blog comment serves a useful and relevant purpose to the blog itself, there is no need to tag comments with the 'nofollow'.
dont put your keywords as your name...you have far more chance of getting them approved if you have a name in the name field
Rightly said, it must serve your purpose(that is link posting) and blogger's as well(i.e a praise or an honest answer).
blog commenting involves writing a brief and concise response that correlates to the blogger's post. Keep it short, relevant, and if you can, ask a question.
For example,if your website is real estate. Search real estate blogs in search engine,you will get lot of blogs.Go one blogs and read any topic.Then click the comment options on that topics.There you can see the name,mail,website.Name you use keywords,then use your website and post you comments about the blogs.
Here are list of dofolow blogs http://www.dofollowblogslist.com/ and make a lenghty comments using your keywords.
First you have to search some blogs related to your business or website. this process will help you lot more.
yahoo answers ==> Easy. do-follow blog comments ==> Medium. forum posting and signatures ==> Medium. social bookmarking service ==> Easy. your website popular ==> Hard.