Today’s featured promo on MacUpdate offers Compost for US$5.99 (70% off, retail $19.95). “Compost, the automatic trash management software for Mac OS X. Compost solves your Trash problems by letting you set a time limit on your trash, cap its size, and maintain a minimum amount of space. Whether you’re an individual Mac user, or a network administrator looking to help your users better manage their free space, Compost can help you.” Compost requires Mac OS X 10.3 or later.