If the air-driven turbine was enough to do anything useful, the performance-oriented crowd would already be using it to force air into the engine. You'd have cold air intakes that stick out from the grille if that really worked. Sure, it might provide a little extra, but it's minimal at most.
The exhaust-powered alternator is being developed by
ThinGap, and is definitely a great idea - but it will probably cost too much to be worth the MPG gains, unless it starts coming as a standard option as new vehicles.
The wind-driven alternator that was posted definitely sounds bogus. And the battery lasting 6 years is cool, but probably has nothing to do with a little fan in the fog light hole.