New to the Auto-Blend control in CS4 is the ability to choose between a panorama and a stack of images. Stack Images draws data from however many similar images you give it. With varied depth of field, this can effectively buy you light (several shots taken at a shallow depth of field can be combined into one image, all focused). More unusual still is the ability to have a prominent, focused

foreground and focused background with a soft blur between. Prior to CS4, this was photographically impossible. Lastly, the Seamless Tones and Colors option in the Auto-Blend Layers dialog helps balance exposure between images. With varied focus, this means countering for the shifts of light between images, but when you take one shot with a flash and another without, the feature can really start to shine.