I think this is gonna be a interesting post for all my readers & for all my commentators. In this article i mentioned few tips need to be taken by all those, who comment on other blogs.

Usual thing
Do not comment in a usual manner, saying nice post or good work. Make your comment to be a major role for your authors article. Make other commentators to think in your way. Rise questions, so that others will know you read somthing.
Comment length
The words short & sweet will not work for everything. Your comment should not be neither long nor too short. Make it simple & make it look elegant.
http://_____/_____ Will work
When you comment on other blogs, make sure you add your about page in the website box of thier comment form. The reason is, when they see your site using your comment, you will gain visit as well as one page visit.
Do check the comment policy
When you comment on other blogs, first read the comment policy before commenting. Try to follow those statements given in the comment policy.
Say Thank You
Once your previous comment was replied (especially your comment was a question). Don’t hesitate to say Thank You. This will increase your reputation in front of other commentators.

Un-related comments
Do not relate any comment beyond the article which you read. Make your comment to travel within the idea of the article. Don’t spam yourself.
Mention the author name in your comment
When you mention the author name, this makes you familiar with the author. Try to find the author name in the about page or you can also find the author name in the post.
Become a top commentator
Most of the blog offers top commentator award for every month. Try to deserve it, so that others know about you & also a simple way to promote you & your blog.
Read & then comment
Read the article then comment it. Avoid writing what the previous commentator have written. Many people comment in a way, just by looking the other comments.
Use a GRAVATOR image
Use an image, so that other can recognise you. Many of the spam comments do not have an image. So with the help of an image, the author can differentiate you from a spammer.
Don’t feel afraid to comment on other blogs!!

Narendran.M is a writer, technical blogger & he is very much proud of saying, he is a learner.
tats a great tips for beginners like me
These are really good inputs….. Thanks for sharing naren
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Don’t be spam, avoid two word comments like, thanks , Ok, Well written etc. (But i am not following this sometimes : ) )
@Anish
Thankx for your comment dude!!
try to follow these tips soon
Thanks naredran for the advice.
@Anish
This is not an advice as you mentioned.. Take this as a request.. Otherwise, this is just the basic way to comment on other blogs..
I believe Yaro calls this tactic a traffic stream that if done consistently can lead to a traffic river. Perfect example of that idea in my niche – I left a comment on Gilbert Arenas’ blog with a link to my blog and an NBA.com writer followed it back and saw a post I did and wrote a related story and linked to us. That link provided the post with over 5,000 pageviews in 3 days. More importantly now an NBA.com writer is reading our blog who can provide us with more traffic surges if he links again.