By tweaking my previous hack to display related posts from Blogosphere, I have come up with another version to do this. This time, I have tweaked it to bring out only the relevant posts or None. I use the "Search in title" operation in Google blogsearch to find the earlier posts with titles that have atleast 2 non-trivial words from the current post's title. I hope this will encourage more people to try this hack.
For plugging-in this feature to your blog, add the following piece of code after the <$BlogItemBody$> tag.
This will display the related posts right after the Post body as you see below (only in post pages). Please note that it won't display anything if there are no related posts. You could also place in any other location in your template that you like to.