By: kelbytv.com/photoshopkillertips
Bring the color back into you sky using this technique.
http://kelbytv.com/photoshopkillertips/2009/10/24/simulating-a-polarizing-filter-for-skies/?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+PhotoshopKillerTips+%28Photoshop+Killer+Tips+%28Video%29%29