How Sidewalks Could Become the Future of Power Generation

        So it's been quite awhile since I've posted here but I thought this article would be a great one to post.  Today on CNN.com's technology section I came across an article entitled "Green Sidewalk Makes Electricity - One Step at a Time".  These small tile slabs which create electricity will be installed at a mall near the 2012 Olympic Games Site in London.
        A 25 year old English engineer invented the recycled paving slabs called "PaveGen".  These small green slabs convert kinetic energy from people walking over them into electricity.  The slabs are designed to compress five millimeters when stepped on creating electricity which can be stored for up to three days.  One step produces enough energy to power a single LED for 30 seconds.  This may not sound like a lot but with hundreds  to thousands of compressions per day, this electricity could add up.
        I see this invention as likely being very costly at this point in time but as the technology is improved upon and becomes cheaper, the sky is the limit for these paving slabs.  They are 100% green and likely just as nearly efficient.  Imagine large slabs being installed on highways where hundreds of cars pass per hour.