By: kelbytv.com/photoshopkillertips
This option under the edit menu allows you to fade the most recently-applied filter.
http://kelbytv.com/photoshopkillertips/2009/10/24/fade-a-filter-2/?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+PhotoshopKillerTips+%28Photoshop+Killer+Tips+%28Video%29%29