Today’s featured promo on MacUpdate offers MacDust for US$2.50 (58% off, retail $5.95). “MacDust is a small and lightweight application designed to clean up your computer. MacDust performs many tasks that could easily take you another five seconds if you weren’t using MacDust. The application also removes hard to get at files, and even files you forget about. The Caches folder can get rather large, so using MacDust at least once a week can save you hundreds of megabytes.” MacDust requires Mac OS X 10.4 or later.