By default twenty Eleven displays the first post as full and the rest with only the title in the showcase template.
This will allow you to display excerpts or full posts instead of just the title.

Open showcase.php and around like 188 find this block of code.

// For all other recent posts, just display the title and comment status.<br />
while ( $recent->have_posts() ) : $recent->the_post(); ?><br />
<br />
<li class="entry-title"><br />
<a href="<?php the_permalink(); ?>" title="<?php printf( esc_attr__( 'Permalink to %s', 'twentyeleven' ), the_title_attribute( 'echo=0' ) ); ?>" rel="bookmark"><?php the_title(); ?></a><br />
<span class="comments-link"><br />
<?php comments_popup_link( '<span class="leave-reply">' . __( 'Leave a reply', 'twentyeleven' ) . '</span>', __( '<b>1</b> Reply', 'twentyeleven' ), __( '<b>%</b> Replies', 'twentyeleven' ) ); ?><br />
</span><br />
</li>

As you can see, there isn’t a section for the_content, so we’ll add one, pretty much the same as content.php uses.

<br />
// For all other recent posts, just display the title and comment status.<br />
while ( $recent->have_posts() ) : $recent->the_post(); ?><br />
<br />
<li class="entry-title"><br />
<a href="<?php the_permalink(); ?>" title="<?php printf( esc_attr__( 'Permalink to %s', 'twentyeleven' ), the_title_attribute( 'echo=0' ) ); ?>" rel="bookmark"><?php the_title(); ?></a><br />
</li><br />
<div class="entry-summary"><br />
<?php the_content(); ?><br />
</div><!-- .entry-summary -->

What we did was, move the .entry-title closing tag under the title, then add the code to display the content of the post, then removed the comment links below it. If you would rather display excerpts just replace the_content with the_excerpt.

Since this is slightly different than the regular content template, adding this bit of CSS will space the title properly under the seperator.

Example in screenshot
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