Codice per http://lloc.it/pimp-a-wordpress-standard-widget.html

MY_Widget_Links.php

<?php

class MY_Widget_Links extends WP_Widget_Links {

	function widget( $args, $instance ) {
		if ( !is_front_page() && !is_home() )
			parent::widget( $args, $instance );
	}

}

function mywidgetlinks_load() {
	unregister_widget( 'WP_Widget_Links' );
	register_widget( 'MY_Widget_Links' );
}
add_action( 'widgets_init', 'mywidgetlinks_load' );