Thank you, Zehrila:
It's probably not the best use of my time, but when commenting on blogs, I only post on sites that are very strict with their comments, and on topics which I am deeply familiar with and have a (somewhat) controversial opinion upon which I can write at least three or four paragraphs. Then I usually just link to my home page.
I might be putting the cart before the horse though. It might be a good idea that after I find a blog from which I would like to receive a comment from, then create a post on my blog that is related to that blog post, and then make a smaller comment that references my own (highly related) blog post.