Want to get a glimpse of the future? Take your first drive inside nine General Motors concept cars -- of which at least six may soon roll off the assembly line! TheCarConnection.com gets the first chance to drive the amazing retro Chevrolet SSR, as well as the massive Hummer H2, the luxurious Cadillac Imaj, the breakthrough GMC Terradyne, and the other GM show cars making the rounds this year. We'll tell you what they're like, then give you the odds on which ones will make it into production.