Index: wp-includes/default-widgets.php
===================================================================
--- wp-includes/default-widgets.php	(revision 15448)
+++ wp-includes/default-widgets.php	(working copy)
@@ -297,7 +297,7 @@
 			<li><?php wp_loginout(); ?></li>
 			<li><a href="<?php bloginfo('rss2_url'); ?>" title="<?php echo esc_attr(__('Syndicate this site using RSS 2.0')); ?>"><?php _e('Entries <abbr title="Really Simple Syndication">RSS</abbr>'); ?></a></li>
 			<li><a href="<?php bloginfo('comments_rss2_url'); ?>" title="<?php echo esc_attr(__('The latest comments to all posts in RSS')); ?>"><?php _e('Comments <abbr title="Really Simple Syndication">RSS</abbr>'); ?></a></li>
-			<li><a href="http://wordpress.org/" title="<?php echo esc_attr(__('Powered by WordPress, state-of-the-art semantic personal publishing platform.')); ?>">WordPress.org</a></li>
+			<li><?php echo apply_filters( 'widget_meta_poweredby', '<a href="http://wordpress.org/" title="' . esc_attr(__('Powered by WordPress, state-of-the-art semantic personal publishing platform.')) . '">WordPress.org</a>' ); ?></li>
 			<?php wp_meta(); ?>
 			</ul>
 <?php