There is a very effective and a simple way of getting each post in your blog indexed. You must remember that search engines have an appetite for HTML links. The more links your blog has the better the chances of it getting indexed. As you may know, not all posts receive comments and not all posts become popular in a blog. You can comment on other blogs using the URL of some of your posts if you want internal links/backlinks to your inner pages of your blog. I had mentioned in my earlier post that posting comments on other blogs with the Name/URL option gives your blog an internal link. Hence, you must encourage people to comment on your blog with their Name/URL option instead of their Google account. I know its out of our control and only people who are aware of this fact may use the Name/URL option.
This is the reason why commenting with URLs is so important to indexing. Posts that have received a few comments with the Name/URL have a much better chance of getting indexed and to appear on the first page of a google search than posts that receive comments with no URL. I am stating this based on my personal experience.