WordPress Single Template By Post Format

This function allows you to use custom WordPress post format templates and suggestions for single.php.

# Place in functions.php
/*
* This snippet allows you to use custom templates for single.php by
* post format like this: single-post-format-quote.php.
*
*/
add_filter('single_template', 'single_template_terms');
function single_template_terms($template) {
    $taxonomies = (array) wp_get_object_terms(get_the_ID(),
                          get_taxonomies(array('public' => true, '_builtin' => true)));
    foreach( $taxonomies as $term ) {
        if ( file_exists(TEMPLATEPATH . "/single-{$term->slug}.php") )
            return TEMPLATEPATH . "/single-{$term->slug}.php";
    }
    return $template;
}

References

single.php 'post-format' template for builtin Post Formats