I have two of those cups. They're awesome! The only thing that sucks is that once the ice melts inside the cup, it's pretty much worthless while you wait for it to refreeze.
and to the guy who said a road system made of magnets. this already exists in a way except it's a train system. they have one in Japan and one in China, I believe. it uses magnets to both lift the train off of the tracks and also to propel the vehicle. by lifting the train off of the tracks, it removes virtually all friction and then uses the magnetic system to propel the train to speeds up to 360 mph. google "Maglev".