From Auto YouTube Downloader:
Auto YouTube Downloader is free software to automatically download all watched videos from any site like YouTube, Metacafe, Vimeo, etc. The downloader doesn't spend extra traffic because it uses the browser cache.
Free Auto YouTube Downloader contains built-in flash player and powerful converter.
Convert flash videos to mobile videos (mov, mp4, 3gp) which are used by cell-phone, PDA, PSP, iPod, iPhone, etc. The downloader extracts audio from videos and converts to mp3. Also supports converting to avi, wmv.
Also you can use Auto YouTube Downloader as a manager of your flash videos. The program has everything you need to organize your best videos. The downloader provides the ability to search through your all downloaded videos, import flash video from local drives or removable disk to your collection and export them, delete unnecessary videos.
Auto YouTube Downloader have easy-to-use interface and customizable view.
See shot video how it works on auto-youtube-downloader.com.