You already know that blog walking is produce backlink for you, but not for blog which use no follow code in their source. But there is still many good blog which very kind, they use rel:follow and it's produce backlink if you leave a comment there. But i wonder, it's take a long time to be indexed if you make backlink from blogwalking. I wanna ask, when google will index my URL which i submit at comment form in many blog?
Sometimes it's not about commenting in the most number of blogs. Just find the one most relevant to your niche with high PR and traffic rank, and that should do the trick. And yeah, it does help to get your site indexed faster especially for new sites.