How to display all posts in a category in WordPress sidebar

Had a few requests by clients to do this and the code is pretty simple:

<li id="recent-posts">
<h2>Our services</h2>
<ul>
<?php query_posts('category_name=abc123&showposts=10'); ?>
<?php while (have_posts()) : the_post(); ?>
<li><a href="<?php the_permalink(); ?>">
<?php the_title(); ?>
</a>  </li>
<?php endwhile; ?>
</ul>
</li>

Replace abc123 in the example above with your actual category name (the “slug”) and change the amount after “showposts” to the desired quantity you wish to display.