Mercurial is a great distributed version control system written in Python. It is a "fast, lightweight source control management system designed for efficient handling of very large distributed projects".

The new version of a fast, lightweight Source Control Management system designed for efficient handling of very large distributed projects is released.

"Welcome to the home of the book 'Distributed revision control with Mercurial', by Bryan O'Sullivan. This is a freely licensed book about the Mercurial revision control system..."

"Mercurial [Hg for short] is a Distributed Version Control System. Instead of using a single repository per project, each developer can have their own repository." -- via http://understandinglimited.com/2008/08/07/ff-h/

"I’ve been meaning to set up a Version Control System for a long time now. VCS as a concept has been around for a while but recently a new paradigm in VCS called DVCS (for distributed version control system) has emerged. This new paradigm has cured or at least mitigated the warts of the old “centralized” version control systems and brought new benefits.

This document summarizes the initial research for adding distributed version control as an option for Google Code. Based on popularity, two distributed version control systems were considered: Git and Mercurial. This document describes the features of the two systems, and provides an overview of the work required to integrate them with Google Code.

"Since Linus Torvalds presentation at Google about git in May 2007, the adoption and interest for Distributed Version Control Systems has been constantly rising. We will introduce the concept of Distributed Version Control, see when to use it, why it may be better than what you're currently using, and have a look at three actors in the area: git, Mercurial and Bazaar..."

LONDON, December 14, 2007 -- Canonical Ltd., the commercial sponsor of the Ubuntu and Bazaar projects, today announced the general availability of Bazaar 1.0, a version control system enabling multiple, distributed developers to contribute to software projects independently in a controlled, managed way.

"Every clone of a Mercurial repository can act as a consistent, fully functional repository itself.This is a very useful property of a DVCS; one that you can take advantage of to make development a lot easier, especially for teams that are dispersed in multiple places of the globe..." — Mercu