You can download this script for free under the GNU GENERAL PUBLIC LICENSE
Latest version available to is version
1.2.2 You can download the latest version below

youtubebrowser_v1.2.2.zip If you are upgrading from a version prior to 1.2.0 make sure that you delete the previous installation first except config.php Changelog - 11 September 2009 (v1.2.2)
- YouTube layout change fixes
- Some other bug fixes
- There should be a little bit less stress on the servers
- 10 July 2009 (v1.2.1)
- YouTube changed the way a file is downloaded slighty (youtube.com/get_video), script updated
- 08 May 2009 (v1.2.0)
- YouTube design change, script updated
- New way to get variables for downloading
- Video images URL was changed as part of YouTube's redesign
- get.php renamed to yt.php as a result of the new web host
- Added HD support for videos
- 29 November 2008 (v1.1.1)
- Bug fix when using the downloader
- 06 October 2008 (v1.1.0)
- Security fix
- Bug fix for removed videos
- Rewritten the XML HTTP Object creator
- Bug in getting the title through the function YoutubeGetLink()
- Added high quality streaming and downloading (if available)
- Users can now view the comments of a video
- 07 August 2008 (v1.0.4)
- Again changes on the YouTube website, a few fixes done
- Video tags didn't seem to work, fixed
- 26 July 2008 (v1.0.3)
- More changes on the YouTube website, a few small fixes done
- 18 July 2008 (v1.0.2)
- YouTube changed website, a few small fixes done
- 22 April 2008 (v1.0.1)
- When searching, it now automatically selects what you were looking for (Videos or username)
- fixed: Searching for multiple strings wouldn't show any results
- fixed: Some errors came up when nothings was found
- 18 April 2008 (v1.0)