Sidebar pushed to bottom of page…?

As you can see from this screenshot, my navigation bar is supposed to be a nice a simple bar under the header image; the search function in the top right; the sub-navigation down the right sidebar. Something went awry, I’m not exactly sure how it happened. Here’s my web site:
Here’s the code that I futzed up (I think):

<?php wp_head(); ?>
</head>
<body<?php if ( is_home() ) { ?> id="home"<?php } ?>>
<div id="page" class="clearfloat">

<div class="clearfloat">
<div id="branding" class="left">
<h1><a href="<?php echo get_option('home'); ?>/"><?php bloginfo('name'); ?></a></h1>
<div class="description"><?php bloginfo('description'); ?></div>

<div class="right"><?php include (TEMPLATEPATH . '/searchform.php'); ?></div>

<ul id="nav" class="clearfloat">
<li><a href="<?php echo get_option('home'); ?>/" class="on">Home</a></li>
<?php wp_list_pages('title_li='); ?>
</ul>

Any ideas?