If you're shooting and correcting Raw images from your digital camera, there's a File Browser trick you can use to quickly correct photos taken in similar lighting conditions. First, open the File Browser, then double-click on your first Raw image. This opens Camera Raw. Make your adjustments, then click OK in Camera Raw. This will open the image in Photoshop, but go back to the File Browser for now. Command-click (PC: Control-click) on the other Raw thumbnails in the File Browser that have similar lighting conditions. Once all the photos are selected, go under the Automate menu and choose Apply Camera Raw Settings. In the resulting dialog, the Apply Settings From pop-up menu should be set to First Selected Image. Click Update and you'll see the thumbnail previews update to reflect your correction (which will be applied automatically when you open these images in Photoshop).