Index: wp-admin/css/wp-admin.dev.css
===================================================================
--- wp-admin/css/wp-admin.dev.css	(revision 18427)
+++ wp-admin/css/wp-admin.dev.css	(working copy)
@@ -4707,3 +4707,7 @@
 .post-categories li {
 	display: inline;
 }
+
+.column-title-thumb {
+    float:left; margin-right: 5px;
+} 
Index: wp-admin/includes/class-wp-posts-list-table.php
===================================================================
--- wp-admin/includes/class-wp-posts-list-table.php	(revision 18427)
+++ wp-admin/includes/class-wp-posts-list-table.php	(working copy)
@@ -530,7 +530,7 @@
 				else {
 					$attributes = 'class="post-title page-title column-title"' . $style;
 ?>
-			<td <?php echo $attributes ?>><strong><?php if ( $can_edit_post && $post->post_status != 'trash' ) { ?><a class="row-title" href="<?php echo $edit_link; ?>" title="<?php echo esc_attr( sprintf( __( 'Edit &#8220;%s&#8221;' ), $title ) ); ?>"><?php echo $title ?></a><?php } else { echo $title; }; _post_states( $post ); ?></strong>
+			<td <?php echo $attributes ?>><?php if (has_post_thumbnail()) {echo "<div class='column-title-thumb'>";the_post_thumbnail(array(32,32));echo "</div>";}?><strong><?php if ( $can_edit_post && $post->post_status != 'trash' ) { ?><a class="row-title" href="<?php echo $edit_link; ?>" title="<?php echo esc_attr( sprintf( __( 'Edit &#8220;%s&#8221;' ), $title ) ); ?>"><?php echo $title ?></a><?php } else { echo $title; }; _post_states( $post ); ?></strong> 
 <?php
 					if ( 'excerpt' == $mode ) {
 						the_excerpt();