When developing and debugging WordPress themes, I am often in the position of being confused about exactly which php template file is loading on a given page. To solve this problem, I have created a plugin that displays the path of the current page template file at the top of the page. It is called, “What Template File Am I Viewing”.
The plugin is available via the normal WordPress plugin installer on your site. Just click “Plugins”->”Add New” and then search for “what template file am i using” and install per normal.
Many many thanks to VegasGeek, who wrote the actual code that is being used in the plugin!