A very cool take on using technology, communications and physical devices to develop new ways to engage with information and explore spatial relationships.
This came out of MIT with NSF funding. Dave Merrill and Jeevan Kalanithi then formed Sifteo to commercialize it, rasing $1m in A round funding from True Ventures. Today, they announced a $9m B round led by True and Foundry Group.
With this and the Six Sense project, MIT is doing some fantastic stuff in human-digital interaction.