Today’s featured promo on MacUpdate offers ViewIt 2.21 for US$9.95 (50% off, retail $20). “ViewIt is an image viewer that supports most popular image formats: JPEG, TIFF, PNG, PSD and more. Images can be viewed in a window or in full screen mode. ViewIt has also tools for: quick image sorting, printing, digital cameras and EXIF tags. Anybody interested in adding their own features to ViewIt can easily do it through its plugin architecture via the SDK.” ViewIt 2.21 requires Mac OS X 10.2 or later.