When I look at the changes I've done with some of my posts, I feel like my blog is turning into a mini Wikipedia! I've put links on the body text here and there to other sections of my blogs.
One of the reasons why Wikipedia and Amazon rank so good in search engines is because they massively interlink their sites. I've done just this, interlinked several of my posts, but only when I felt it as appropriate! Never link for the sake of just linking. :) Relevance, and appropriateness is the key.