Menampilkan Post dari Spesifik Category/Tags

=====================
BERDASARKAN KATEGORI
=====================
<ul class="posts">
	<?php query_posts('cat=5&showposts=10'); while (have_posts()) : the_post(); ?>
		<li><a href='<?php the_permalink() ?>'><?php the_title(); ?></a></li>
	<?php endwhile; ?>

	<?php wp_reset_query(); ?>
</ul>

==================
BERDASARKAN TAGS
==================
<ul class="posts">
	<?php query_posts('cat=5&showposts=10&tag=demo'); while (have_posts()) : the_post(); ?>
		<li><a href='<?php the_permalink() ?>'><?php the_title(); ?></a></li>
	<?php endwhile; ?>

	<?php wp_reset_query(); ?>
</ul>

Sumber: http://alijafarian.com/how-to-display-wordpress-posts-for-a-specific-category/