Adding featured image to RSS feed in Wordpress
This can be easily done with the following code added to your theme functions.php file:
function add_rss_item_image() { global $post; if(has_post_thumbnail($post->ID)) { $thumbnail = get_attachment_link(get_post_thumbnail_id($post->ID)); echo"\t<image>{$thumbnail}</image>\n"; }}add_action('rss2_item', 'add_rss_item_image');add_action('rss_item', 'add_rss_item_image');You can use the same method to output a custom field value in your feeds.
Good luck!