The DICE box costs about £70 from
Daltec AI Ltd - Suppliers of car kits and in-car accessories who are in the UK, order it today, you'll have it tomorrow. It charges your iPod and allows you to play from it at the same time.... I don't understand why devices that don't do both are even on the market
The dice connects via the bus connector on the bottom of the iPod, and therefore allows you to use the car stereo controls to control the iPod (great for skipping tracks when on shuffle). If you can't do this, surely it's as distracting/dangerous/illegal as using a mobile phone whilst driving.
Also the DICE box has an AUX input, to allow you to connect a DVD player, other MP3 player or SATNAV to your car stereo. Plus, you can switch the controls on the iPod off/on via a DIP switch on the DICE, although I'm not sure why you'd want to switch them off (but my girlfriend's ALPINE car stereo doesn't allow you to use the iPod's own controls, which kinda sucks).