Hybrid cars are getting to be a big thing due to the price of gasoline, do they have hybrid yachts?

Although appealing there isn't much of a way to recapture energy in a boat. Hybrid cars 'save' the energy wasted when braking in a battery and use that to re-accelerate the car. Boats don't have brakes so no recapturing energy that way. I'd say that a sail boat with a kicker engine or those wind jammer yachts (that have large diesel engines) could be considered hybrids b/c they're using a combination of propulsion methods to move the vehicle (boat). Diesel electric subs (see WWII and earlier) could also be considered hybrids. Back to pleasure boats... I don't see an easy adaptation of hybrid tech (as you're thinking of it) to them.