A plugin that adds the "Featured Image" column in admin posts and pages list.
Important Backup your files and database.
(Recommended) Install directly from the WP Directory through your admin panel Plugins > Add New > Search for "Post List Featured Image". Click install under the name, and activate when prompted.
Upload post-list-featured-image.zip via "wp-admin/plugin-install.php?tab=upload" or if using FTP, unzip
post-list-featured-image.zip and upload
/post-list-featured-image/ directory to the
Activate the plugin through the 'Plugins' menu in WordPress (under plugin name: "Post List Featured Image").
Find more Installation options at http://jaggededgemedia.com/plugins/post-list-featured-image/