I agree with not posting comments in blogs just to post your advertisements in them. I find that to be quite rude and so do most people. Instead, link your name with your website address. Most blog posts have that function. That way, people can click on your name if they are truly interested and it doesn't look like you're spamming. Also add something informative to the post as well. That way, people will want to visit you to see who made that interesting post.