The Suntory Mermaid II is an interesting take on an alternative power vessel... powered by a contraption that gets energy from the waves, this is a 9.5 meter cat that is aiming to make a voyage from Honolulu, HI to Asia.

The home page here has pictures but most of the language is Japanese (?). There is an English language page with a lot of the info. There is also a Popular Science blurb about it.

Always nice to see other takes on "self powered" boats that don't rely on the fossil fuels.