This is the neatest proposition I’ve seen/ read about in quite some time. IBM’s Zürich Research Lab demonstrated at Supercomputing 2008 how, within 5 years, they’re going to have data centers that use water pumped through microchannels within computers for cooling rather than traditional air conditioning or fans. Here alone we are talking about saving annual energy costs by billions of dollars! Then, additionally, this water that would absorb the heat from the huge data centers will be used to heat nearby homes, which would save more energy dollars. If this comes true, we are talking about a very efficient and effective step towards a greener earth, in my opinion. Even as I am holding my breath, you can read this interesting article here.