UPDATE [2013.05.01]: Simplified steps and updated code and sample. As a dear reader pointed out, the old post wasn't beginner friendly (and yes I confused myself as well).
By default, at the end of each Blogger post, we get the "Newer Post" and "Older Post" navigation links. As I have seen in other sites, it looks better if it showed the next and previous post titles instead. So in this tutorial, I will show you how to customize your post navigation links so that it will display the titles of your next and previous posts.
Replace "Newer Posts" and "Older Posts" with post titles.