Begginer tutorial series about Blender tools to get environment. The sky - Background

Hi again.
This time I want to introduce all newcomers to the many tools that Blender has for achieving the background or environment of the scene. The first part is about the background.

Watch it in Vimeo: http://vimeo.com/103774629
Watch it in youtube: http://youtu.be/0dRfD3xkEOo