Video muy ilustrativo sobre el tema
<iframe src="http://player.vimeo.com/video/23962096?title=0&byline=0&portraiā¦; width="400" height="300" frameborder="0" webkitAllowFullScreen mozallowfullscreen allowFullScreen></iframe><p><a href="http://vimeo.com/23962096">Drupal development with git, Features and simpletest</a> from <a href="http://vimeo.com/user1854727">Albert Albala</a> on <a href="http://vimeo.com">Vimeo</a>.</p>