Everyone these days is downloading, watching, and sharing videos from video-sharing sites like YouTubeGoogle VideoMetaCafe,DailyMotionVeohBreak, and a ton of other similar sites. Whether you want to watch the video on your iPod while working out, insert it into a PowerPoint presentation to add some spice, or simply download a video before it’s removed, it’s quite essential to know how to download,convert, and play these videos.

Free Web services for downloading videos from video-sharing sites
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ClipNabber allows you to download videos from YouTube, Metacafe, etc by simply copying and pasting the URL. You’ll then get a link whereby you can download the file to your computer, iPod, iPhone, or any other media player. You’ll need to have an FLV player for the YouTube videos. Quick and very easy to use!
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Zamzar is a free online file conversion web application that can not only convert videos off the Internet to AVI, MPEG, 3GP, MP4, MOV, etc, but also converts between audio, image, and document formats. Paste the URL into Step 1 and then convert the file to your favorite format.
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VideoDownloader is a FireFox extension, but also allows you to paste in any URL from many sites such as Blip.TV, iFilm, and even social networking sites like MySpace. You can also download a free FLV player from their site to play the videos.
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Vixy.net is another site that not only downloads online videos, but will also convert them AVI, MOV, MP4, 3GP, or MP3 (if you want to extract the audio from the file). Using this site, you don’t have to worry about downloading a FLV player as you can convert it to Windows format. (Same as Zamzar)
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KeepVid also supports just about any video sharing site out there and the only difference about this site is that it also has a Top Videos section, so you can quickly download the most watched videos around the web.
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Media Converter is similar to ZamZar and vixy.net, but requires you to create an account and log in. Also, it seems like it only supports downloading and converting videos from YouTube. You can also download their video download program, but it only supports 5 sites.
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Hey! Watch is an online video encoding web service that encodes video into different formats including HD very quickly. The graphical interface is very nice and there are lots of features and options, such as the ability to transfer any video from the web directly to an FTP server or to online storage.
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YoutubeX, as the name suggests, allows you to download videos from YouTube.Obviously, it only supports YouTube, but it has a couple of other features, such as the ability to play your video on the site and find popular videos quickly.
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VideoRonk searches across multiple video-sharing sites such as Google Video, YouTube, MetaCafe and DailyMotion to find the most popular videos on each of them. You can either watch them on VideoRonk or download them to your computer in FLV format.

Source: techpraveen.com

 
This Youtube Downloader is a great tool for downloading you tube video clips directly to your computer so you can view them offline.

Download Instructions

Navigate to this site http://download.cnet.com/YouTube-Downloader/3000-2071_4-10647340.html
Click on Download Now
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The web page below will display, click on the warning message along the top of the website and click "download file"
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The Run box below will display, click on Run
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The executable file will now download onto your system, Click open once this is complete
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A second run box will open, Click on Run
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The Download Wizard will now open click on Next to start the wizard
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The terms and conditions will now be displayed as shown below, read these then click I Agree
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You will now be shown where the file will be downloaded to. Click Next
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You will now be prompted with installing the Yahoo search bar and setting Yahoo as your home page. To avoid this deselect both tick box's and click next
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The File is now ready to to install, Click on Install
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The Youtube Downloader will now install, once it is finished click on Finish and you will see the Youtube Downloader Open as shown below
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How to use the Youtube Downloader
Go to www.youtube.com
Search your video
Click in the Address bar and copy the URL
Minimize your web browser and click into the first box of the Internet Downloader and click paste
Check the destination of where you are saving your video
Click Download