It's white, it has the obligatory intra-capped word prefixed by a lowercase 'i', and a docking plug. It can only be one thing: an interface for your iOS device.
Joking aside, we really like the iRiffPort. Its flat profile means it'll sit on your desk. You plug your headphones into the guitar end of the cable, rather than the iPod so your headphone lead isn't trailing too far, and it gives you a digital connection to your device.