Just a quick one that will disable the editor on ALL pages and posts, handy if you only use custom fields.
<?php
// Remove the editor from ALL pages and posts
function disable_editor_on_all_pages_and_posts() {
remove_post_type_support( 'page', 'editor' );
remove_post_type_support( 'post', 'editor' );
}
add_action( 'admin_init', 'disable_editor_on_all_pages_and_posts' );