Here is wonderful plugin for displaying links to related posts beneath each of your wordpress…
Adds a widget that shows posts related to the current post based on tags.
Display related posts based on common categories and tags.
Pro Related Post Widget plugin.dynamically show related post according to post.
A related posts widget. Related posts show by matching category and tags.
With the Relative Posts plugin widget you can show up on the sidebar a list…
Allows you add latest post widget in your sidebar with ajax pagination & customizable template.