Today’s featured promo on MacUpdate offers ContentBarrier X4 for US$24.95 (64% off, retail $69.95). “ContentBarrier sets up a protective wall around your computer. Its predefined categories let you choose what you don’t want your children to see, and you can also create your own custom categories. ContentBarrier blocks adult Web sites, sites with subjects not fit for children, and even blocks chats when predatory language is used. It blocks offensive content coming from the Internet. ContentBarrier works with multiple users; if you have several children, you can set different criteria, corresponding to their age or maturity.” ContentBarrier X4 requires Mac OS X 10.3.9 or later.