http://www.alexgirard.com/git-book/index.html
http://progit.org/book/
http://hgbook.red-bean.com/read/handling-repository-events-with-hooks.html
http://changelog.complete.org/archives/594-more-on-git-mercurial-and-bzr
https://git.wiki.kernel.org/index.php/GitComparison
http://nvie.com/posts/a-successful-git-branching-model/