Door: kelbytv.com/photoshopkillertips
Use the tab key for more workspace and again to bring back your palettes.
http://kelbytv.com/photoshopkillertips/2009/11/04/showing-and-hiding-palettes-2/?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+PhotoshopKillerTips+%28Photoshop+Killer+Tips+%28Video%29%29