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http://www.uvmedia.com/how-git-open-atrium

How to Git Open Atrium | UV Media

UPDATE: "Open Atrium has moved from its single monolitic repository to an install profile and a drush make based build system. This is a change that primarily effects developers. The complete, ready to install, download will continue to be offered at http://openatrium.com". Details here.
— After December’s request for donations, I’m happy to announce that the first version of Gitorious private repositories is now available for testing. What is it? With the new private repositories feature, you can allow users of your Gitoriou... 29 Feb 09:19 http://gitorious.org/

Gitorious

Introduction This article introduces version control and Git without assuming you have any prior knowledge or programming experience. Because of its introductory nature, certain details are simplified or omitted and the use of the Git Graphical User Interface ( Git GUI ) is emphasized.

Git: Your New Best Friend [Server Side Essentials]

http://www.sitepoint.com/version-control-git/
https://github.com/whymirror/why-archive This is an archive of things that made _why known to many on the web. Please feel free to fork and add, though please respect _why's license and copyright of any material. Licenses should be included where possible. Anything you guys think is an interesting bit of content as long as there is a license to go with it. The wiki on this project already has a start on listing things so check it out if you want some ideas.

whymirror's why-archive at master - GitHub