At CNET Car Tech, we spent September 2006 to April 2007 traveling the world to see the latest concept cars at the major auto shows. We've gathered photos of the most significant concepts in one place so you can see the design directions of major carmakers. See Chevy trying out environmentally friendly cars. See Hyundai desperately working on a crossover. See Honda and Acura struggle to figure out what its future cars will look like. Mazda shows off a clear design direction, while Toyota takes a stab at a Prius successor.