Blender 3D: Noob to Pro/User Interface Overview
Blender's user interface (the means by which you control the software) is not particularly easy to learn. However, it has improved over time and is expected to continue doing so. The current version of the Blender software is 2.66.1. You can download it from the Blender website.
The tutorials in this section will familiarize you with the basics of the user interface. By the end of this section, you should be able to:
- resize, split, and merge any Blender window
- change the type of any Blender window
- access user preferences
- access panels containing buttons and other controls
- change the viewpoint of a viewport
For those new to Blender, this is the most important section of the book.
Advice on Customization 
Blender is a complex software package with many customizable features. You can customize the user interface to assign new functions to buttons and hotkeys. In fact, you can change almost anything to suit yourself. However, this complicates the giving and following of directions. It is recommended that you adhere to the default screen arrangements of Blender in order to be able to follow well in the remaining parts of these tutorials. Blender ships along with some 4 to 5 screen-content arrangements which are suitable for almost any kind of job you'll want to use it for - from creating motions and animations to doing games.
We recommend leaving Blender's user interface in its "factory settings" while working through the Noob to Pro tutorials. At the very least, wait until you've mastered the basics before you customize the interface - and we know you definitely will when you master it!