WP RSS Thumbnails

wp-rss-thumbnails.php

<?php
// Add Thumbnail To RSS
function rss_post_thumbnail($content) {
	global $post;
	if(has_post_thumbnail($post->ID)) {
		$content = '<p>' . get_the_post_thumbnail($post->ID) . '</p>' . get_the_content();
	}
	return $content;
}
add_filter('the_excerpt_rss', 'rss_post_thumbnail');
add_filter('the_content_feed', 'rss_post_thumbnail');
?>