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Community work is the backbone of the project as it's open source. With that in mind, one thing that I haven't yet covered is the process of committing your custom code back to the main area for others to use.
We'll use several tools throughout the video after I give an introduction to Git (the system used by Drupal to control different versions of the software).
Video: http://www.youtube.com/watch?v=u_eYxW9T774
Git: http://git-scm.com/
Sourcetree OS X Git GUI: http://www.sourcetreeapp.com