Ruby on Rails repository virtulization from 2004 to 2009 with Gource

this video is just amazing! used very good configuration of the Gource open source project (http://code.google.com/p/gource/).
5 first second don't show good, but to awesome after that!

april 2008, the month rails moved to github, you can see what's going on on that month! huge surge in commits and commiters.