PhotoJAR: Post Thumbnailer displays a post thumbnail. A full gallery can be displayed upon clicking the thumbnail when paired with a javascript viewer. 
PhotoJAR: Post Thumbnail requires PhotoJAR: Base.
For additional info visit <a href="http://www.jarinteractive.com/code/photojar" rel="nofollow ugc">JARinteractive</a>.

PhotoJAR: Post Thumbnail

PhotoJAR: Post Thumbnailer displays a post thumbnail.  A full gallery can be displayed upon clicking the thumbnail when paired with a javascript viewe …

wphigh

Admin Featured Thumbnail WordPress plugin can Add featured image thumbnail to WordPress admin columns. It will help you easy to know which post is attached the featured image. Add click the thumbnail will popup preview the full image.
It also support custom posts.
<a href="http://www.wphigh.com/portfolio/admin-featured-thumbnail-wordpress-plugin" rel="nofollow ugc">Feedback Admin Featured Thumbnail</a>

Admin Featured Thumbnail

Add post thumbnails to admin list of posts.

PhotoJAR: Post Thumbnail vs Admin Featured Thumbnail