Yep, you can get it back using Pacifist. Just insert your OS X install DVD (disc 1 if it's a multi-disc set), launch Pacifist, click the "Open Apple Install Discs" button, search for "Image Capture.app" without the quotes, take the first result, and install it. Afterwards you may want to download and run the 10.6.2 combo update so that Image Capture is sure to be the latest version.