What if you had a ton of cheap, commodity screens lying around? The MIT Media lab is exploring just that with Siftables. They have a demo application where they sort and manipulate photos, with each photo on a Siftable.

Or what if you had a ton of mice? Microsoft Research India realized that tons of kids huddle around one computer in Indian schools. Only one kid has control of the mouse, while the rest are relegated to be mere onlookers. Solution: give every kid a mouse, and make educational games that are multi-mouse aware.