Mercurial:

Mercurial: The Definitive Guide - a very detailed description of Mercurial including behind the scenes, an indepth article on the design of Mercurial. Understanding Mercurial - the concepts behind Mercurial. Note: This guide doesn't require any prior knowledge of version control systems (though subversion users will likely feel at home quite quickly). Basic command line abilities are helpful, because we'll use the command line client. Basic workflows We go from simple to more complex workflows. Those further down build on previous workflows.