This is a few years old now. I saw it go by on some technology news forum or other and bought a couple for my wife and me. It is from LaCie and the image shows that it is about the size of an old UK Penny, which is what I have epoxied to the other side. You twist it to make the USB port come out.
Here is an image of a similar USB "coin" with the contacts visible: http://mint.sk/nakup_info.php?code=670907&w=0&bg= (The mint in Kremnica, SK sells several types of that "stick".) Christian
I wonder if one could use a 'flat' kind of flash drive and a simple mold to make one of these for any coin? I wouldn't mind a walking liberty half one of these...