Siftables are a collection of small, self-contained input / display devices wirelessly link together to form an independent mini-network, or a control system for a PC. The cubes feature OLED screens, a 3-axis accelerometer, Bluetooth, flash memory, and a haptic actuation driver, and feature additional ports for attaching other devices.

Early Siftables Interaction Demos from Jeevan Kalanithi on Vimeo.
There are more videos here. Visit their site here.
Here’s a TED talk about Siftables: