Today’s featured promo on MacUpdate offers djay for US$24.99 (50% off, retail $49.99). “djay is the groundbreaking digital audio player and music mixing software for the Mac. It integrates with your iTunes library and allows you to mix your entire digital music collection with two realistic interactive turntables. You can record your mixes live, or send them to other connected djays over the Bonjour network in real-time.” djay requires Mac OS X 10.4 or later.