I'm trying a LinkWithin Widget which should be adding links to related posts (to the site, not the feed) based on the content. The recommendations should become more relevant as it indexes the blog,
I have checked it in IE8, Firefox and Chrome but would be interested to hear what you think of it. It seems to load after the main post content but adds thumbnail images (if the post has image content) so interested if there are any performance issues.
Show Related Posts with the LinkWithin Widget - everything.typepad.com