Youtube Video Downloader will let you download videos from Youtube.com or any website with videos using .flv format.
Just install it, surf the web, and when you find the video you want to download, copy & paste the link in the New Download URL textbox and it will be saved in your harddisk.
To play FLV files you need a FLV player.
Software Developer Homepage
File Size = 441 KB
From Software Author.