They call it a dock; I would argue that it doesn’t dock with anything. It just connects to the speakers inside the Lego case.
I wonder if you can add real Legos to it? Probably not, but that would be kind of cool, then you could build it into an actual dock, oh well though.
Anyways, there are speakers inside the Lego that run of your iPod’s power. It costs about $16 and can be bought from some Asian sight that I cannot readily translate.
Funky Gadgets – The Lego block iPod Dock [via gadgettastic]