"HP Research is working on ways to enable DJs to scratch and mix digital music. The HP DJammer has three programmable buttons that can be set for specific features: DJs can hold a track (just like they hold vinyl on a turntable), and a built-in motion sensor monitors the DJs hand movement. Moving the hand, and the DJammer will scratch the track at the point the music is held. Over wi-fi several DJammers can also be used collaboratively."
Before you laugh this story off,
take a look at how these DJammer's are being used in the club scene. Pretty interesting if you ask me.