This plugin lets you select a specific template for a taxonomy term, just like pages
This plugin lets you select a specific template for a category, just like pages
Custom Template Generator for Newsletter.
This plugin allows theme authors to create a post tempate as well as page template for the single post.
WordPress plugin to create a custom post type for Press Mentions. Includes a (¡GENESIS!) template for displaying the single article, and custom field
Posts Page: Use Page Template
Get the Beauty of Your Webpages in Your Posts Too