Google for wordpress related posts plugin and you will find many of them but for Blogspot Blogger situation is was quite different.

Mohamed Rias posted a solution which involve some Blogger template hacks but solves long pending related post problem. He described all modifications in very clean and simple manner so I think every Blogger can benefit from it.

For codes and instructions check Mohamed Rias’s post. Thanks Debajyoti Das.

Link: Related Post Solution for Blogspot Bloggers

Related: Google AdSense Tricks for Blogspot Bloggers