Everyone of us visits youtube everyday and watch some videos there.Havent you ever felt the need to download them.There are several methods to download videos from Youtube.I will explain a few
Kiss YouTube 
This method doesnt need any additional software or extension or anything of that sort. You tube video links will be of the form
http://www.youtube.com/watch?v=video_id To download this video just add a
kiss before
youtube ie. change the url to
http://www.kissyoutube.com/watch?v=video_id eg:To download
http://www.youtube.com/watch?v=Wa4m5J6mgm8 goto
http://www.kissyoutube.com/watch?v=Wa4m5J6mgm8 There you will see option to play the file and also an option to download it to your pc.
Video Download Firefox Extension Download videos from Youtube, Google Video, Pornotube, Grinvi... and many other sites with simply one click... Get the video download Extension from
here. Whenever you are watching a you tube video you will see a box to the right showing something about the video and also a related videos box.To download the video just right click on the video on the right pane and choose
Download Video Similarly you can also download the related videos by right clicking on them and choosing to download. Video Download is available for Internet Explorer and Opera To get Video Download for IE or Opera visit the
official site of video download..