I've been thinking of getting a WHS machine for a while now to hold and back-up all my important data and something had been concerning me - running a server 24/7 and the costs (to my bank balance and the environment). The guys at Tranquil PC seem to have nailed this one with a solid machine!
It has a great form factor designed to be low power consumption and uses only 24W in basic configuration. I did a bit of searching to see what that means in simple terms and it ends up being about half a desktop PC.
Now, if I bring this back to the Imagine Cup and "Imagine a world where technology enables a more sustainable environment for all" you can see the opportunity to write software solutions which maximise the investments in cost saving hardware. What might that idea be?