Join the discussion and view the tutorial on Tutvid.com: http://tutvid.com/photoshop/learn-mask-90-seconds-photoshop-tutorial/
Masking is the granddaddy of skills in Photoshop. Master masking and you’re well on your way to conquering Photoshop. In graphic and web design as well as photograph retouching, masking is the fastest and easiest way to erase layers without actually erasing them. This allows you to fine tune your adjustments and graphics down to the pixel without worrying about erasing or having to undo a thousand times. Check out this “Photoshop in 90 seconds” tutorial to learn how you can start masking today.