Wordpress: List all posts in 2 columns

Can someone tell me how I can make a list of all my posts in a list format in 2 columns with alphabetical letters. So far this code only made 1 column I want it into 2 columns

<?php
// Reference: http://wordpress.org/support/topic/148727

$posts = new WP_Query("cat=3&orderby=title&order=ASC&showposts=-1");
if ($posts->have_posts()) :
	for($i='A';$i!='AA';$i++) :
?>
<h3 id="<?php echo $i; ?>"></a><?php echo $i; ?></h3>
	<ul>
<?php
		while ($posts->have_posts()) :
			$posts->the_post();
			if( $i == strtoupper(trim(substr($post->post_title, 0, 1))) ) :
?>
	<li><a href="<?php the_permalink(); ?>" rel="bookmark" title="<?php the_title_attribute(); ?>"><?php the_title(); ?></a></li>
<?php
			endif;
		endwhile;
?>
	</ul>
<?php
	endfor;
endif;
?>

Code (markup):

 

You can use recent post plugins to set that.

 

Recent posts plugin can't list all the post and it doesn't give each alphabetical letter

 

I use a free theme which does it - you could look at how they did it.

http://www.ygosearch.com/seoblog/?p=63

And another variation of that: http://www.ygosearch.com/seoblog/?p=32