I saw those Sushi USB thumb drives last week on Sorobangeeks. Now japanese gadget exporter Dynamism is actually selling them.
The Sushi Replica USB Drives come in 128MB and 32MB configurations. The 128MB Sushi sells for $109.00. The 32MB Tuna Maki sells for $79.00. There are five different sushi's available. See the list here.
Other "useful" USB Gadgets:
USB Glowing Aquarium
Sombrero Wearing USB Webcam 352 Review
USB Ionizer Gadget Review
i-Duck a Japanese glowing Duck USB Storage Device
Japanese Eyeball USB WebCam GE-POCAM
The Mini Power Minder