Google Tech Talk: Bryan O'Sullivan on Mercurial

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"Bryan O'Sullivan is a Senior Principal Engineer at QLogic, Inc, where he works on HPC clustering and compiler technologies. He likes to write software tools that help other engineers, and to build interesting distributed systems. He is an enthusiastic rock climber of sadly limited facility.
Mercurial is a free distributed revision control system. It focuses on conceptual simplicity, robustness, and high performance. Well-known open source projects that use Mercurial include OpenSolaris, Xen, and One Laptop Per Child. This talk presents some of the advantages of using Mercurial to manage large, fast-moving projects.
The video gives a brief overview of the techniques used to achieve, in Python, a level of performance that outshines most other revision control systems. Finally, some novel revision control techniques that take advantage of Mercurial's extensibility and high performance are introduced." [June 19, 2006]