create links from within lesser postings to higher value postings to increase those high value postings' search results position.
Not all blog posts are equal, and you might wish certain of them to get more attention than others.
Where it makes sense and is sensitive to the context, create a link from other, less valuable blog postings on your blog to a post on your blog that you know is of greater value to visitors. This has the effect of increasing the likelihood search engines will favor that higher value blog posting when displaying search results.