The thing about innovation is that to follow up, you tend to need another dose of innovation to keep people interested. Case in point: Mercedes-Benz having shoes to fill with its little SLK. The original was one of the first cars on the market with a modern retractable hardtop, taking after its costlier... 

For some, driving a Mercedes-Benz roadster is special enough. But when the local high-end mall is surrounded by row upon row of the Three-Pointed Star, some look for a little something extra special. For such European customers, Mercedes has launched a pair of special editions. The SL Night Edition...