[Jose] sent in his efforts to build his USB Transferer. I’m pretty sure it’s a gameboy flash cartridge interface based on the Atmel AT90USB647 AVR microcontroller. Once the prototype board came in, he soldered the controller, gutted an old gameboy for the cartridge connector and had the device showing up on his PC by the end of the day. Oddly, the card he’s interfacing with is a USB device on it’s own. Until a few more details are published, I’d assume that the interface would be useful for connecting to more than just that particular card.