Rename main menu items in Wordpress admin
<?php
// Rename Posts in admin to News
//Taken from here http://wp.tutsplus.com/tutorials/creative-coding/customizing-your-wordpress-admin/
function edit_admin_menus() {
global $menu;
$menu[5][0] = 'News';
}
add_action( 'admin_menu', 'edit_admin_menus' );
?>