http://www.chromeextensions.org/other/easy-youtube-video-downloader/

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The most popular Firefox Youtube downloader now comes to Google Chrome providing the easiest method to download YouTube videos in FLV, MP3, 3GP, MP4, 720p and 1080p FULL-HD video qualities.

• Version:4.1
• License:GPL
  CPAL
• Developer:Youtube
• Homepage:Visit Website
• Support:Visit Website
• Works With:Developer Builds
  Beta Builds
  Developer Builds (Linux)
  Stable Builds 
• Rating:
   (1,553 votes, average: 4.35 out of 5)
  
• Downloaded:856828 times

http://www.chromeextensions.org/other/easy-youtube-video-downloader/