functions.php

<?php

/**
 * Remove post titles from Grid Loop
 * 
 * @author Bill Erickson
 * @link http://www.studiopress.com/forums/topic/grid-loop-plugin-remove-post-title/
 */
function be_remove_grid_loop_titles() {
	if( apply_filters( 'is_genesis_grid_loop', false ) )
		remove_action( 'genesis_entry_header', 'genesis_do_post_title' );
}
add_action( 'genesis_before_entry', 'be_remove_grid_loop_titles' );