Tutorial: Setting up a Raspberry Pi with NOOBS @ The Adafruit Learning System. Using NOOBS to install an operating system.
In this tutorial, you will learn how to use NOOBS (New Out Of the Box Software) to setup your Raspberry Pi.
NOOBS is a minimal disk image that can just be copied onto a newly formatted SD card. You then put it into the SD slot on the Raspberry Pi and It downloads the rest of what it needs.