Solid Alliance, they guys who make the USB Sushi drives, offer now a very small USB drive dubbed iDisk Diamond.
The iDisk Diamond measures 27x12x1.9mm and weighs only 1g. It has somewhat the size of a SIM card.
It still fits though into a standard USB port. The tiny flash drive has 128MB storage. In the Solid Alliance announcement is also a photo of somebody having the iDisk Diamond in his ear. Interesting way to demo a product. More details on AkihabaraNews and on Solid Alliance (Japanese).
Don't Miss: The hottest Apple Rumors for 2017