I comment on blogs for a number of reasons:
1. I have something I want to say, generally I have an opinion about everything and I like to voice it whether I agree or disagree.
2. Promote myself, let’s face it, commenting on blogs is NOT SEO, it is promotion when you leave a link to your site. I think this is a common misconception for commentators.
3. Build community, I see much of the same people commenting on the same blogs I comment on, and many of them come to my site as well.
4. Interaction, it is my belief the Weblogs were started and Web 2.0 is part of a movement to create actual interaction back and forth rather than just “reading” an article, you can add your input or ask questions etc…

Just my opinion…
.-= Keith´s last blog ..Do you Use Disqus Or Other Comment Sign In App? =-.

Thanks for the kind words anyway, relationships definitely is important.
.-= Mikkel Juhl´s last blog ..How to Build Credibility for your Blog =-.

Back to the topic in hand… I comment for the same reasons as Brendan listed earlier, but I’d like to add another one: relationships.

Having relationships with other bloggers is a great thing (no, I don’t mean boyfriend and girlfriend… I mean as “contacts”), because in the end it’ll come back to help you. Take me and Alex Fraiser of Blogussion for example… in the early days of his blog, I was a regular commentator. Through that, I’ve now done several guest posts on his site, and he’s been interviewed twice on Teenius, had a guest post published and, best of all for me, he designed my theme for me. Having that sort of contact with other bloggers is invaluable and it all came from commenting on his blog!
.-= Simon | Teenius´s last blog ..Keeping Your Blog Busy Over The Holidays =-.

@Jordan Well, now when I comment on other blogs I am not just posting “Great post” etc. I try to write a quite good comment that others can use to something.

I actually did that on JohnChow’s recent blog post. Anyway. But well I am trying to write a helpful and thoughtful comment.

Have a nice day, everybody!

What do you want people to think when they see your comment? Just an automaton looking for back links or someone that stimulates most thoughts towards the topic at hand? I prefer the latter… if that means I only comment on a fraction of blogs because of it, then so be it. Meaningful impact in a smaller sphere can easily outweigh superficial activity on a larger scale.
.-= Jordan Cooper´s last blog ..The Downside of Comment Reciprocation: Are You Lying To Yourself? =-.

Good video Mikkel! You will get better with these videos in time. It’s true that practice makes perfect.
.-= Brendan Wenzel´s last blog ..How I Use Other People’s Traffic to Build My List =-.