Download HD Videos From www.youtube.com

To download HD videos from www.youtube.com without any software, go through the following steps :

1) Open the video you want to download

2) Ensure that the HD button is present (i.e. ensure that the HD verison of the video is available on youtube.com)

3) Type out the following piece of code in the address bar.

javascript:window.location.href = 'http://youtube.com/get_video?video_id=' + swfArgs['video_id'] + "&fmt=22" + "&l=" + swfArgs['l'] + "&sk=" + swfArgs['sk'] + '&t=' + swfArgs['t'];

4) The video should start downloading

Download Videos from YouTube

To download videos from youtube.com, dailymotion.com, and other popular web sites without downloading and installing any software :
1) Copy the URL of the video you want to download.
2) Visit the site http://www.keepvid.com/ and paste the URL.

The site gives you a link to download the video in .flv and .mp4 formats.