A fancy laptop sleeve. £29.99 at pcworld and currys.
*d3o is a specially engineered material made with intelligent molecules. They flow with the product but upon shock lock together to absorb the impact energy. Impact Wrap is constructed from high grade Ballistic Nylon with all impact ares integrated with revolutionary d3o an intelligent material that locks its molecules together on impact to absorb the energy of a shock and provide superior protection for your laptop. The revolutionary d3o is an intelligent protective material that transforms from a soft flexible gel to a shock absorbent casing on impact. Used by extreme sports brands and professional athletes from around the world. d3o offers unique impact protection for your netbook. At rest the molecules inside d3o move freely making it soft and flexible while at the point of impact or shock the molecules lock together to spread and absorb the force safeguarding your netbook in a protective layer. The protective d3o material transforms from a soft flexible gel to a shock-absorbent casing on impact."
More information on protection etc: http://www.tech21.uk.com/products-laptop-15-impactwrap.html
Video of guy getting whacked in knee: http://www.youtube.com/watch?v=yVmZtZ5bvKQ&feature=player_embedded#!
Hit on elbow: http://www.youtube.com/watch?v=JceDaEMIHKE&feature=related