To be honest Joe I don’t believe in a link building technique that rules, I think you need to use a mixture of strategies. The problem I have with blog commenting is that most blogs are no follow and the ones that aren’t usually pass very little juice, however thats not to say you can’t use it in small niches. For niche sites I like to use a mixture of directory submissions, article marketing and making use of blog networks like linkvana.

If blog commenting is working for your niche sites then don’t stop, all I would say is try to mix it up a little as if Google were ever to devalue blog comment links you could see a huge drop.