Sort Posts (or Pages) by title

sort-posts.php

<?php
/*
Plugin Name: Set Post Order In Admin
Version: 0.1
Plugin URI: http://wordpress.org/support/topic/336715/
Description: In Posts->Edit, display posts in title order.
Author: MichaelH
Author URI: http://codex.wordpress.org/User:MichaelH/MyPlugins
*/

function set_post_order_in_admin( $wp_query ) {
  if ( is_admin() ) {
    $wp_query->set( 'orderby', 'title' );
    $wp_query->set( 'order', 'ASC' );
  }
}
add_filter('pre_get_posts', 'set_post_order_in_admin' );
?>