functions.php:
if ( function_exists('register_sidebar') )
register_sidebar(array(
'before_widget' => '<li id="%1$s" class="widget %2$s">',
'after_widget' => '</li>',
'before_title' => '<h2 class="widgettitle">',
'after_title' => '</h2>' ));
sidebar.php
<ul id="my_sidebar">
<li id="texto-personalizado">
<h2 class="widgettitle">Titulo Personalizado</h2>
<p>texto personalizado</p>
</li>
<?php if ( !function_exists('dynamic_sidebar') || !dynamic_sidebar() ) : ?> <?php endif; ?>
</ul>