actually... he was probably looking at the UMD format.
Nope, it was something like the mini-disc as xlsior mentioned, but I dont recall it being exactly that....
Anyhow, just finished watching the Nintendo conference, and all I can say is, how many more $#&*ing secrets does Nintendo still keep hidden about the Wii? Man, the fact the Nunchuk extension to the remote has it's own built-in sensor, and the fact the remote itself has a built-in speaker......