To put it in context, your iPod can hold around 10,000 songs, give or take. This thing is about a million times denser than an iPod hard drive. So if you equipped an iPod with a bunch of these, you could store around 10 billion songs, assuming that scaling it up to that size wouldn't, we don't know, create a supernova (the dangers of nanotechnology are poorly understood, at least by us). We can say that the researchers were able to stick eight of these together to create one byte of memory, so there's that.
This can store roughly 1/3rd of a nipple.
Otherwise, the only problem (despite the fact that no Chinese sweatshop kids have hands small enough to assemble them) is that right now this thing requires something called a scanning tunneling microscope to operate, which is a device that most people don't have readily on hand. The atoms also have to be kept incredibly cold, or else it opens up a rift in the space-time continuum or something.
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Keeping things cold to avert disaster is a field we have some experience in.