JuiceBox MMC

The kit is actually a great buy, you get a MMC->usb adapter that is supported under linux, as well as a 32MB SD card. The Juice Box cartridge that uses the MMC card is nothing but the MMC socket and a pcb, no electronics, which means it can be used in other projects.

The kit retails for $39.99

If you can't find a kit you can hack your own

Now you can also hack the cartridge to boot uclinux

The kit will handle SD cards, but does not implement the extra pins.


 * http://www.juicebox.com/checkver100/ - software checks here for updates.