Want to download your favorite Video from youtube.com,
Try out http://www.youtubecatcher.com/
Downloads the video in *.flv Format (later can be converted to *mp3 format, to enhance quality in the same site).Copy the URL of the video available on the explorer and add to the space available in the site and end it by pressing download button.
Right now I am down loading all zoo-zoo commercials as my 2 year old daughter is fond of it (me too).