<div id="sidebar">
<?php if ( !function_exists('dynamic_sidebar') || !dynamic_sidebar() ) : ?>

     <div id="sbitem">
         <h2>Меню сайта</h2>
         <div id="tags">
         <p><?php wp_tag_cloud('smallest=10&largest=14&orderby=name'); ?></p>
         </div>
     </div>
      
  <div id="sbitem" class="rss_links">
   <h2>Stay updated via RSS</h2>
   <ul>
    <li><a href="<?php bloginfo('rss2_url'); ?>" title="Full content RSS feed">Content RSS</a></li>
    <li><a href="<?php bloginfo('comments_rss2_url'); ?>" title="Full comments RSS feed">Comments RSS</a></li>
   </ul>
  </div>
<?php endif; ?>
</div>

<ul>
<?php wp_list_categories('orderby=name'); ?>  
</ul>

wp_list_categories('title_li=&orderby=name')