The cash for clunkers program was, by most accounts, a huge success - its goal was to get people buying cars, and it worked to the point that the program ran out of money.  It ends tonight, though, and the real question is whether people will continue to buy cars in its absence. Depending on what shoppers brought to the table in terms of a clunker, they received $4,500, and that's a significant percentage of some new cars' price tags, after ...