Stop posts from showing up multiple times on the same page.

gistfile1.php

<div id="top-featured" class="clearfix home-block">
	<?php
	$do_not_duplicate = array();
	$my_query = new WP_Query( array(
		'post_type' => 'features',
		'posts_per_page' => 1
	) );
	while ($my_query->have_posts()) : $my_query->the_post(); ?>
		<div id="post-<?php the_ID(); ?>" <?php post_class(); ?>>
			<div class="above-post">
				<div class="date pull-right"><?php echo date( 'M j, Y' ); ?></div>
				<h1 class="content-block-title">Today's Top Feature</h1>
			</div><!--end post header-->
			<div class="entry">
				<?php the_excerpt(); ?>
			</div>
		</div><!--end post-->
		<?php $do_not_duplicate[] = $post->ID; ?>
	<?php endwhile; /* rewind or continue if all posts have been fetched */ ?>	  
</div>

<div class="row-fluid">
	<div id="fa-col" class="span6">
		<div class="features home-block">
			<div class="above-post">
				<h2 class="content-block-title">Software Articles</h2>
			</div><!--end post header-->
			<?php
			$my_query = new WP_Query( array(
				'category_name' => 'software',
				'posts_per_page' => 5,
				'post__not_in' => $do_not_duplicate
			) );
			while ($my_query->have_posts()) : $my_query->the_post(); ?>
				<div id="post-<?php the_ID(); ?>" <?php post_class(); ?>>
					<div class="entry clear">
						<h3><a href="<?php the_permalink(); ?>" rel="bookmark" title="Permanent Link to <?php the_title_attribute(); ?>"><?php the_title(); ?></a></h3>
						<?php the_excerpt(); ?>
					</div><!--end entry-->
					<?php $do_not_duplicate[] = $post->ID; ?>
				</div>
			<?php endwhile; /* rewind or continue if all posts have been fetched */ ?>
		</div>
	</div>
</div>