How to download You tube Vedios ?

1. Open the http://www.youtube.com
2. Search for the video and copy the url of the video you want to download.
3. Open the website called http://www.savevid.com/
4. Paste the copied url in the url provided by this site and hit 'Download' button
5. After few seconds it will give you download option with different file format(such as, flv,avi,mp4) choose one of them and enjoy.

If you want only the audio of the youtube video, then go the website called http://vidtomp3.com and repeat above steps.

How to search a vedio on youtube having specific words??

Google Inc. has lunched a web site called gaudi (http://labs.google.com/gaudi) . Navigate to this site, There is a search box. Type the word you want search, it will index the word and bring all the you tube vedios.