Index: wp-includes/category-template.php
===================================================================
--- wp-includes/category-template.php	(revisione 32646)
+++ wp-includes/category-template.php	(copia locale)
@@ -823,7 +823,7 @@
 			$title_attribute = call_user_func( $args['topic_count_text_callback'], $real_count, $tag, $args );
 		}
 
-		$a[] = "<a href='$tag_link' class='tag-link-$tag_id' title='" . esc_attr( $title_attribute ) . "' style='font-size: " .
+		$a[] = "<a href='$tag_link' class='tag-link-$tag_id tag-cloud-item-".count($a)." tag-cloud-size-$real_count' title='" . esc_attr( $title_attribute ) . "' style='font-size: " .
 			str_replace( ',', '.', ( $args['smallest'] + ( ( $count - $min_count ) * $font_step ) ) )
 			. $args['unit'] . ";'>$tag_name</a>";
 	}