You can add multiple desktops to the Mac OS X Mountain Lion by using Mission Control, formerly known as Spaces. Can be really useful if you are a busy multi-tasker.
A bit longer Photoshop tutorial, but still very suitable for beginners, where you will learn how to carve a random text into human skin from scratch and make it look realistic.
Awesome guys at Visual.ly just released a a free online tool that can visualize Google Analytics stats into a great looking report in a form of infographic in a matter of basically only a click.