Wow, they really did what I was thinking about since 1 year, a very small, cheap but very efficient headless computing device that you could use everywhere. A thing like that has an unlimited number of possibilities... you could embedded it everywhere:
in car, it would use a 12V inverter do power itself and could be a gps with the use of a sd card and a usb antenna, a media player / equalizer / amplifier which read music from your sd card, or by USB from your mp3 player.
at home, it could be used in domotic, media station, ftp/http server for ITs, and you could use it to install monowall and turn it into a crazy router if they add a second network chipset.
militaries could use it to create cheap very intelligent weapons
that's crazy, at 49$ I would buy 1 for sure to set a file server.