Peugeot is showing a concept based on the 307 saloon called the 307 CC HybrideHDi. It incorporates a diesel-electric hybrid powertrain with a hardtop cabrio Peugeot 307. At Peugeot's website (www.peugeot.com), the company calls it a double hybrid, referring to the concept's hybrid powertrain, as well as its hybrid architecture. It transforms from an elegant coupe to a convertible in a few seconds.

Currently, it's only a concept, but as Europe gets farther into the hybrid realm, it may become a reality (of course, it being a Peugeot means it may never see U.S. streets).

gthang