Here are some cool tricks to download the youtube videos:

1) Add ‘kiss’ text before the displayed URL in your address bar. Then download the video and save the file with ‘*.flv’ extension.

2) You can use ‘VideoDownloader Firefox Extension’ which add a small icon on the status bar at the bottom of your firefox window, and a toolbar button. Just click that and download the video you are watching!You can install it from http://javimoya.com/blog/youtube_en.php.

Some sites which allows you to easily download the youtube videos:

a) downloadyoutubevideos.com.

b) techcrunch.com.

c) youtubia.com.

d) vidgrab.com.

e) vixy.net.

f) youtubex.com.