that's why this a shit idea.
As for sds, slow shitty and requires adapters to work on most machines. I'm pretty sure usb2 transfer rate is much, much, much higher. Capacity is less too i think, usbs i've seen ~32Gb (even though i think its a shit idea using a usb flash card), most i've seen sd is ~ 8GB. You get the same read only locks on usb pens, but i thought this was a proper flash format... reading the article its clearly not and i think its a shit idea.
They need to make standalones with a standard write-once flashcard format, fully specced. Not hack a usb drive and stick an avi on it.
So tacking a movie format onto something like a usbpen or a sd card is just as shitty as the poor upgrade we got with hd-dvd and bluray