Raspberry Pi are very small and very cheap (between $20 and $50) mono-board computers, based on ARM. They run small dedicated Linux distributions. People use them either for education, as a small low cost computer, as servers, or for any kind of robotics or embedded application.
You will find more informations there : http://en.wikipedia.org/wiki/Raspberry_Pi
For the one I use, I added a small usb wifi dongle and I powered it with some kind of external battery for smartphone or tablet. I configured it as a Wifi Access Point, on which I log with my android tablet. It allows me to have a portable complete linux distribution in my bag (the battery + card are a bit bulky for a pocket, but it fits in), which among other thing I use to run Dungeon Crawl, nethack, or other kind of roguelikes when I am in the subway or train :-)
You will find more informations there : http://en.wikipedia.org/wiki/Raspberry_Pi
For the one I use, I added a small usb wifi dongle and I powered it with some kind of external battery for smartphone or tablet. I configured it as a Wifi Access Point, on which I log with my android tablet. It allows me to have a portable complete linux distribution in my bag (the battery + card are a bit bulky for a pocket, but it fits in), which among other thing I use to run Dungeon Crawl, nethack, or other kind of roguelikes when I am in the subway or train :-)
