This is amazing stuff. The description from the YouTube page says it best: “This Code Swarm provides an animated visual representation of the changes made to the Joomla! source code since 2005. The names that appear are the users who have made changes to the source code. The stars/highlights represent commits made to the Subversion repository. The histogram to the bottom left displays activity. Look out for the date displayed in the right hand corner.”
That “instance” floating around in there is me. Even without the “holy cow, that’s me!” factor, this is a wonderful visualization tool.