Numark has launched the iDJ, a gadget that allows you to mix tracks from two iPods. So while a record box can carry around 100 pieces of vinyl, with two 60-GB iPods you can choose your set from a library of 30,000 songs. And you don’t have to be a master of the dance floor like Fatboy Slim to use the iDJ. Simply slot your iPods into the two docking ports — which also act as chargers — and use the iDJ’s controls to navigate your way through the iPods’ menus. Once you’ve selected the tracks you want to play, you can use the system’s cross fader to blend songs — although, as you’re using MP3s, you won’t be able to scratch like a hip-hop DJ. The console costs around $400 and is compatible with standard iPods, iPod Minis and, with an adapter, the Nano.