Add Class To Last Post In A Loop
<?php
function ccd_last_post_class($classes){
global $wp_query;
if( ( $wp_query->current_post+1 ) == $wp_query->post_count ) $classes[] = 'last';
return $classes;
}
add_filter( 'post_class', 'ccd_last_post_class' );
?>
WordPress Snippet