You guessed it, the Petito
is a teeny USB key, hence the clever name. You can see for yourself just how small it is, thanks to the helpful quarter next to it. Except that I've never actually seen a quarter in real life so I'm still in the dark on the whole size issue. Still, I'm willing to take their word for it, and with 512MB or 1GB capacities, the storage space is not to be sniffed at. Designed to be worn as a necklace should the urge overwhelm you, it's also available in a selection of colours. I'm not at CeBit this year (excuse me as I try to stifle a 'hurrah!') but if you're currently hauling your arse round the hells halls of Hannover, you may just stumble into the ATP Petito stand.
More USB goodness:
Gold & Diamond USB Stick
JetFlash multi-coloured USB Drives
Simply Scarlett Lipstick USB Key
Looked through my stack of foreign coins, and found that the US quarter in just about as big as the 50 eurocent coin. I also found a (UK) one-shilling from 1964 of the same size. All are about 24 mm, or just under 1 inch, in diameter.