Never seen the gadget before today, found it as a buyers recommendation when looking for Sphero found via http://www.heise.de/newsticker/meldung/Angerollt-Roboter-Kugel-Sphero-1542563.html.
“Each Sifteo cube packs a clickable, full color LCD display, a variety of motion sensors and a rechargeable battery into a sturdy 1.5 inch block – perfect for hands of all ages to grab and play with.
Sifteo cubes connect wirelessly to a nearby computer via a compact USB radio link, and can hold up to 4 hours of play on a single charge. Our SiftRunner desktop software is your command-center: browse and play your games, create your own with the Sifteo Creativity Kit™, and find more in the Sifteo store! The included Sifteo charging dock can recharge up to six cubes at once, and can house your cubes and USB link when not in use.”
Company blog site http://blog.sifteo.com/