Albert Bertilsson

This plugin gives you an overview of page templates in your site. You get both an overview of all templates and how many pages they have. You also get a detailed view of all the pages using a specific template.
Usage for this can be to identify unused templates and to find pages using specific templates to change them in some way.

Template Usage

Template Usage gives you a simple overview page of all page templates in your site, allowing you to easily find pages using a specific template.

iDo8p

NOTE : This plugin is translation ready 
NOTE : You need php 5.2+
Add the ability to create post template. 
You can manage templates and use them to prefill a post. 
Also prefill the post title.
Work with wordpress and wordpress mu. 
Works with qtranslate.
Inspirated from “Article Templates”

Template Usage vs WPMU Prefill Post