Djay

Ever wanted to dabble in the dark arts of DJing, but lack the funds to buy a room full of specialized equipment? Now all you need is an iPad. Djay ($20) is a full-on virtual DJ system for the iPad, offering two virtual turntables (unfortunately sans microphone), mixer, tempo, and EQ controls, direct access to your iPad's music library, AirPlay integration, BPM analysis with automatic beat and tempo matching, the ability to record your sets, an Automix mode, and support for 4.2 multitasking, so it can keep playing the background while you sneak in a couple stages of Angry Birds.