Few days ago I found Gource — a software version control visualization tool. Software projects are displayed as an animated tree with the root directory of the project at its centre. Directories appear as branches with files as leaves. Developers can be seen working on the tree at the times they contributed to the project.
I started it against OpenEmbedded repository and was amazed. Looks really nice but also shows that we are too big project for that tool. After experimenting with arguments I generated short video which shows how we worked:
It took over 9 (nine!) hours to generate but was worth it. Especially I suggest to check moment when stable/2009 branch was created (1st April 2009) — it is best seen with frame by frame mode.