If you only want the title and the post excerpt (so no metadata) try this:
<?php
$args = array(
'meta_key' => 'sgt_slide',
'meta_value' => 'on',
'numberposts' => -1,
);
$slides = get_posts($args);
if ( !empty($slides) ) : $exl_posts = Array(); ?>
<div class="slideshow"><div id="slideshow">
<?php foreach( $slides as $post ) :
setup_postdata($post);
global $exl_posts;
$exl_posts[] = $post->ID;
?>
<div class="slide clear">
<div class="post">
<?php if ( has_post_thumbnail() ) echo ''.get_the_post_thumbnail($post->ID, 'slide',
array(
'alt' => trim(strip_tags( $post->post_title )),
'title' => trim(strip_tags( $post->post_title )),
)).''; ?>
<div class="post-category"><?php the_category(' / '); ?></div>
<div class="post-content">
<h2>"><?php the_title(); ?></h2>
<?php if ( has_post_thumbnail() && function_exists('smart_excerpt') ) smart_excerpt(get_the_excerpt(), 50); else smart_excerpt(get_the_excerpt(), 150); ?></div>
</div>
</div>
<?php endforeach; ?>
</div>
</div>
<?php endif; ?>
if you also want the post’s author and creationdate displayed, try this:
<?php
$args = array(
'meta_key' => 'sgt_slide',
'meta_value' => 'on',
'numberposts' => -1,
);
$slides = get_posts($args);
if ( !empty($slides) ) : $exl_posts = Array(); ?>
<div class="slideshow"><div id="slideshow">
<?php foreach( $slides as $post ) :
setup_postdata($post);
global $exl_posts;
$exl_posts[] = $post->ID;
?>
<div class="slide clear">
<div class="post">
<?php if ( has_post_thumbnail() ) echo ''.get_the_post_thumbnail($post->ID, 'slide',
array(
'alt' => trim(strip_tags( $post->post_title )),
'title' => trim(strip_tags( $post->post_title )),
)).''; ?>
<div class="post-category"><?php the_category(' / '); ?></div>
<div class="post-content">
<h2>"><?php the_title(); ?></h2>
<div class="post-meta">by <span class="post-author">" title="Posts by <?php the_author(); ?>"><?php the_author(); ?></span> on <span
class="post-date"><?php the_time(__('M j, Y')) ?></span> ? <?php comments_popup_link(__('No Comments'), __('1 Comment'), __('% Comments'), '', __('Comments Closed') ); ?> <?php edit_post_link( __( 'Edit entry'), '? '); ?></div>
<?php if ( has_post_thumbnail() && function_exists('smart_excerpt') ) smart_excerpt(get_the_excerpt(), 50); else smart_excerpt(get_the_excerpt(), 150); ?></div>
</div>
</div>
<?php endforeach; ?>
</div>
</div>
<?php endif; ?>