this loop is the same, just rewinded and used again (here are no different loops) and does what you need on the index page of seosumo.com
<?php query_posts('showposts=1');
while (have_posts()): the_post(); ?>
<div class="entry" id="post-<?php the_ID(); ?>">
<div class="postheader">
<span class="postinfo postdate"><?php the_time('F j, Y'); ?></span>
<span class="socialb">
</span>
<h1 class="typeface-js"><a href="<?php the_permalink() ?>" rel="bookmark"><?php the_title(); ?></a></h1>
<span class="postinfo"><?php _e("Filed under:"); ?> <?php the_category(',') ?> — Posted by <?php the_author() ?> @ <?php the_time() ?> <?php edit_post_link(__('Edit This')); ?></span>
</div>
<?php $more = 1; the_content(); ?>
<?php link_pages('<p class="pagenavigator"> ', '
', 'next', ' next page', 'previous page '); ?>
<div class="postfooter postinfo"><?php the_tags(__('Tags: '), ', ', ' — '); ?></div>
<!-- end Entry --></div>
<?php endwhile; ?>
... boring html css code and then ...
<?php rewind_posts(); query_posts('offset=1'); while (have_posts()): the_post(); ?>
<div class="excerpt" id="post-<?php the_ID(); ?>">
<div class="excerptcont">
<div class="postheader">
<span class="postinfo"><?php the_time('F j, Y'); ?></span>
<h1 class="typeface-js"><a href="<?php the_permalink() ?>" rel="bookmark"><?php the_title(); ?></a></h1></div>
<?php the_content(__('(more...)')); ?>
<!-- end #ecxerptcont --></div>
<!-- end #ecxerpt --></div>
<?php endwhile; ?>