Related Posts?

In my last post on here, I got some great help implementing previous/next post functionality in the Carrington theme. Now what I’m wondering is how I go about putting a related posts module above the comment area on single_default.php.

In other themes, this is accomplished by calling a function wp32_related_posts apparently, but using this same code in Carrington doesn’t seem to work, and I can’t find where that related_posts function resides in the other themes to begin with.

Has anyone added this to the Carrington theme that wouldn’t mind sharing?