Want to download YouTube Videos? Use these

• YouTubeX - Just copy the youtube video link and paste it in the box with submit button named get video and you can download the video.
• Video Downloader - One of the popular Firefox extensions that allows you to download videos to your computer from YouTube and most video sites.You get file saved in format get_video.Rename it to some extension which you player supports.
• KeepVid -This one helps you to download videos from most of the sites like youtube.
  
• TubeSock - TubeSock 2.0 downloads YouTube or DailyMotion videos from the web and saves them to your video iPod, Mac, or PlayStation Portable. TubeSock knows how to convert the video using the codecs and bitrates best for each device. It can even add the video to iTunes for you.
• VideoDL - It's a quick AJAX application that allows you to download online video into your computer. It supports top 3 video sites - YouTube, Google Video, and Break.com.
• Download YouTube via bookmarklets - A collection of Greasemonkey scripts and bookmarklets to do the job.supports YouTube, Google Video, Metacafe, Myspace, Break.com, Putfile, Dailymotion, Sevenload, MyVideo.de and Clipfish.de.
  
• Youtube-dl - is a small command-line program to download videos from YouTube.com. It requires the Python interpreter, version 2.4 or later.
• YouTube Downloader - enter url and download YouTube videos.
• Youtube Grabber - is a free tool that downloads FLV files from youtube.
• GooTube FLV Retriever - enter the video page URL, download the youtube video.
• Capture Youtube and Google videos - save them as AVI files encoded in the MPEG4 format, using only one command.
• YouRipper - a freeware software which enables you to download videos from the YouTube and Google Video
• Save YouTube Videos - paste the youtube video url and download the video.
• Kyootoob - is a youtube downloader and optionally a converter.
• Orbit downloader : A download manager which can download media files like flash from youtube and all