Thumbget is a simple way to get the thumbnail from a YouTube video. You just need the video url or video id and Thumbget will return the Thumbnail images in all there sizes as per YouTubes api specifications.
I made Thumbget firstly as a little or quick PHP and api challenge, i finished it in one night. I thought i would then host it so others could benefit and find convenience in the web app. The back end is nothing advanced but i had fun making it and i think it can come in handy for those wanting to get or download a thumbnail from a YouTube video.